22 Japanese ways to say “Just this once”

Sometimes, we all want to say “Just this once” in a way that feels natural and a little special. Whether it’s giving in to a small indulgence or agreeing to a favor, Japanese offers plenty of charming ways to express this idea.

In this article, you’ll discover 22 different Japanese phrases that capture “Just this once” in various tones—from casual and friendly to polite and even very native-like. Each one comes with a clear pronunciation guide and a bit of context so you can use them with confidence.

Learning these phrases is a fun way to deepen your understanding of Japanese nuance and make your conversations more colorful. You’ll also see how subtle differences in wording can change the vibe of your message.

Whether you’re chatting with friends, writing a message, or just exploring Japanese, these expressions will come in handy. Plus, they’re easy to remember with a little practice, and you can impress others by choosing the perfect phrase for the moment.

Ready to add a dose of warmth and personality to your Japanese? Let’s jump in and explore these delightful ways to say “Just this once.”

Enjoy the journey, and feel free to bookmark this list for whenever you want to sprinkle some Japanese charm into your day!

Getting Comfortable With “Just This Once”

Before diving into the phrases, it’s good to know that “Just this once” can be expressed through different Japanese words depending on the context—like favor, permission, or a one-time exception.

Understanding these subtleties makes it easier to pick the right phrase. Many expressions use words like 一回 (ikkai), meaning “one time,” or 今回 (konkai), meaning “this time.”

Knowing these basics helps you recognize and remember the phrases faster.

Sometimes, using a great beginner phrasebook can give you a perfect starting point for a cohesive understanding.

With that, here are your 22 ways to say “Just this once” in Japanese!

Each phrase includes Romaji and pronunciation tips to help you speak naturally and confidently.

Part 1: Casual Suggestions

1. 一回だけね (Ikkai dake ne) – “Just one time, okay?”

This is a straightforward way to say “Just this once.”

一回 (ikkai) means “one time,” and だけ (dake) means “only” or “just.” The ね (ne) at the end adds a friendly confirmation, like “okay?”

It’s casual and perfect for close friends or family.

Using this phrase lets you gently set a limit without sounding harsh.

Related phrases like 一度だけ (ichido dake) also work similarly.

Try it out next time you want to allow something just once with a smile.

2. 今回だけ (Konkai dake) – “Only this time.”

今回 (konkai) means “this time” or “this occasion.” Adding だけ (dake) makes it “just this time.”

This phrase is simple and polite enough for many situations, yet casual enough for everyday use.

It’s a great go-to when you’re making a one-time exception.

Be careful not to confuse it with 今度 (kondo), which means “next time.”

Example: “今回は特別だよ。” (Konkai wa tokubetsu da yo.) – “This time is special.”

Great for showing flexibility with a warm tone.

3. 一度だけだよ (Ichido dake da yo) – “Just once, you know.”

一度 (ichido) means “one time,” so this phrase emphasizes a one-time allowance.

The だよ (da yo) ending adds a casual, friendly vibe, like “you know.”

It’s often used to soften a refusal or limit.

This phrase works well when you want to keep things light.

Remember, the tone is key — it should sound warm, not strict.

Try pairing it with a smile for best effect!

4. 今だけ (Ima dake) – “Only now.”

今 (ima) means “now,” so 今だけ (ima dake) means “just now” or “only this moment.”

This phrase is great for expressing a one-time chance or exception happening right now.

It’s short, catchy, and often used spontaneously.

Be mindful it focuses on the current moment, so it’s less about a single occurrence over time.

Example: “今だけ特別！” (Ima dake tokubetsu!) – “Special just now!”

Perfect for sales, offers, or quick favors.

5. たった一回 (Tatta ikkai) – “Just one time.”

たった (tatta) adds emphasis meaning “only” or “mere,” so たった一回 means “just one single time.”

This phrase is a bit stronger and emphasizes the rarity or importance of the one-time event.

It’s casual but can carry a serious tone depending on context.

Use it when you want to stress “this is really just once.”

Be careful not to overuse it, as it can sound a bit final.

Great for promises or limits you want to highlight firmly.

6. 一回限り (Ikkai kagiri) – “Only once.”

限り (kagiri) means “limit” or “only,” so 一回限り means “limited to one time.”

This phrase is a bit more formal and often used in notices or warnings.

It’s great for emphasizing strict one-time conditions.

Use with care—this phrase sounds more official than casual.

Example: “このサービスは一回限りです。” (Kono sābisu wa ikkai kagiri desu.) – “This service is only once.”

Good to know for formal conversations or signs.

7. 今だけだよ (Ima dake da yo) – “Just this once, you know.”

This is a friendly and casual way to say “Just this time.”

The だよ (da yo) ending adds warmth and familiarity, perfect among friends.

It’s often used to soften a favor or permission.

Great for encouraging someone gently.

Example: “今だけだよ、特別に。” (Ima dake da yo, tokubetsu ni.) – “Just this once, especially for you.”

Try it when you want to sound approachable and kind.

8. これだけは (Kore dake wa) – “At least just this.”

これ (kore) means “this,” and だけは (dake wa) roughly means “at least just.”

This phrase is used to emphasize a minimum or exception you’re willing to make.

It’s casual and often expresses a small concession.

Be aware it can imply reluctance or that you’re making a special exception.

Example: “これだけは許してね。” (Kore dake wa yurushite ne.) – “Please forgive me just this once.”

It’s perfect for softening a request or favor.

Part 2: Polite & Formal Suggestions

9. 今回だけ許してください (Konkai dake yurushite kudasai) – “Please forgive me just this once.”

This is a respectful and polite phrase using 許してください (yurushite kudasai), meaning “please forgive.”

It’s perfect when asking for a one-time exception formally.

It shows humility and sincerity.

Use it in professional or serious situations.

Example: “今回だけ許してください、必ず守ります。” (Konkai dake yurushite kudasai, kanarazu mamorimasu.) – “Please forgive me just this once, I promise to keep my word.”

This phrase helps build trust even when making a special request.

10. 一度だけお許しください (Ichido dake o-yurushi kudasai) – “Please allow just once.”

Similar to the last phrase but uses 一度 (ichido) for “one time.”

お許しください (o-yurushi kudasai) is very polite, making it suitable for formal requests.

It’s often used in customer service or formal apologies.

Keep your tone humble and genuine when saying this.

Example: “一度だけお許しください、必ず改善します。” (Ichido dake o-yurushi kudasai, kanarazu kaizen shimasu.) – “Please allow just this once, I will definitely improve.”

Perfect for situations requiring respect and politeness.

11. 今回限りのお願いです (Konkai kagiri no onegai desu) – “It’s a request just this time.”

お願い (onegai) means “request,” and 今回限り (konkai kagiri) means “just this time.”

This phrase is polite and emphasizes the uniqueness of the request.

It’s often used when asking for a rare favor.

Using 限り (kagiri) implies a strict limit.

Example: “今回限りのお願いですが、ご理解ください。” (Konkai kagiri no onegai desu ga, go-rikai kudasai.) – “It’s a request just this once, please understand.”

Great for formal emails or conversations.

12. 一回限りの特別な許可です (Ikkai kagiri no tokubetsu na kyoka desu) – “It’s a special permission just once.”

特別な (tokubetsu na) means “special,” and 許可 (kyoka) means “permission.”

This phrase is formal and often used in official contexts.

It highlights the exceptional nature of the permission.

Use when you want to emphasize that it’s a rare allowance.

Example: “これは一回限りの特別な許可ですので、大切にしてください。” (Kore wa ikkai kagiri no tokubetsu na kyoka desu node, taisetsu ni shite kudasai.) – “This is a special permission just once, so please treat it carefully.”

Good for formal documents or serious dialogue.

13. 今回のみのご承知ください (Konkai nomi no go-shōchi kudasai) – “Please acknowledge just this once.”

ご承知ください (go-shōchi kudasai) is a very polite phrase meaning “please acknowledge” or “please be informed.”

今回のみ (konkai nomi) means “only this time.”

Use this expression in polite requests or formal notifications.

It’s perfect for situations where you want the listener to understand a one-time condition.

Example: “今回のみのご承知ください、今後は変更ありません。” (Konkai nomi no go-shōchi kudasai, kongo wa henkō arimasen.) – “Please acknowledge just this once; there will be no changes going forward.”

It’s useful in professional communication.

14. 一度限りのご容赦をお願いします (Ichido kagiri no go-yōsha o onegaishimasu) – “Please forgive me just once.”

ご容赦 (go-yōsha) is a polite term meaning “forgiveness” or “pardon.”

This phrase is very respectful and used when asking humbly for an exception.

It’s common in customer service or formal apologies.

Remember to use a sincere tone when saying this.

Example: “一度限りのご容赦をお願いします、以後気をつけます。” (Ichido kagiri no go-yōsha o onegaishimasu, igo ki o tsukemasu.) – “Please forgive me just once, I will be careful from now on.”

Best for situations needing humility and politeness.

15. 今回限りでお願いします (Konkai kagiri de onegaishimasu) – “Please, just this once.”

Using で (de) to indicate “with” or “by,” this phrase politely asks for a one-time allowance.

It’s concise and suitable for formal requests.

Easy to remember and use in business settings.

Example: “今回限りでお願いします、次回はありません。” (Konkai kagiri de onegaishimasu, jikai wa arimasen.) – “Please, just this once; there won’t be a next time.”

Good for emphasizing finality with politeness.

Try this when you want to sound professional yet kind.

16. 一回限りで結構です (Ikkai kagiri de kekkō desu) – “Once is enough.”

結構です (kekkō desu) means “that’s fine” or “enough.”

This phrase politely states that one time is sufficient.

It’s useful for limiting requests or offers politely.

Example: “一回限りで結構です、ありがとうございます。” (Ikkai kagiri de kekkō desu, arigatō gozaimasu.) – “Once is enough, thank you.”

Use it to express gratitude and set boundaries gently.

Great for maintaining politeness in formal conversations.

Part 3: Very Casual / Native-like Expressions

17. 今だけな (Ima dake na) – “Just this once, okay?”

This is a very casual and friendly way to say “Just this once.”

The な (na) ending adds a laid-back, masculine nuance often used among close friends.

It’s perfect when you want to sound easygoing.

Example: “今だけな、特別に許すよ。” (Ima dake na, tokubetsu ni yurusu yo.) – “Just this once, I’ll forgive you specially.”

Great for informal chats and relaxed vibes.

Use with people you know well to keep it natural.

18. たまにはいいよ (Tamani wa ii yo) – “Once in a while is fine.”

たまに (tamani) means “once in a while,” and いいよ (ii yo) means “it’s fine.”

This expression is casual and implies leniency for occasional exceptions.

It’s less about “just this once” and more about “sometimes it’s okay.”

Example: “たまにはいいよ、頑張ったからね。” (Tamani wa ii yo, ganbatta kara ne.) – “Once in a while is fine, since you worked hard.”

Perfect for encouraging a friend or loved one.

Use it to sound supportive and relaxed.

19. 一回だけだってば (Ikkai dake datteba) – “I said just once!”

Adding だってば (datteba) adds emphasis and sometimes playful frustration.

This phrase is very casual and often used when repeating or insisting on the “just once” limit.

It’s great for expressing light annoyance without being rude.

Example: “一回だけだってば、もうやらないよ。” (Ikkai dake datteba, mō yaranai yo.) – “I said just once, I won’t do it again.”

Use it among close friends or siblings.

It adds personality and emotion to your speech.

20. 今回だけな (Konkai dake na) – “Just this once, okay?”

This is a casual, friendly phrase with the な (na) ending for a soft, persuasive tone.

It’s often used when allowing something special just this time.

Example: “今回だけな、特別だよ。” (Konkai dake na, tokubetsu da yo.) – “Just this once, it’s special.”

Perfect for lighthearted permissions or favors.

Use with friends for a natural feel.

Easy to remember and say with warmth.

21. 一回だけね (Ikkai dake ne) – “Only once, okay?”

Similar to #1 but with a softer tone using ね (ne) for gentle confirmation.

It’s very common in everyday speech for setting limits kindly.

Example: “一回だけね、約束して。” (Ikkai dake ne, yakusoku shite.) – “Just once, promise me.”

Great for casual conversations with loved ones.

It sounds warm and approachable.

Try it to keep things friendly and clear.

22. これだけは今回だけ (Kore dake wa konkai dake) – “Just this, only this time.”

This phrase combines これだけ (kore dake) meaning “just this,” and 今回だけ (konkai dake) meaning “only this time.”

It adds emphasis on a single item or exception being allowed just once.

Example: “これだけは今回だけ許して。” (Kore dake wa konkai dake yurushite.) – “Just this, only this time, please forgive me.”

It’s casual and heartfelt, perfect for close relationships.

Use it when you want to be sincere and clear.

Memorize it for those moments when you need to express special exception warmly.

Concluding Thought

Exploring these 22 Japanese ways to say “Just this once” reveals the richness and subtlety of the language. Each phrase carries its own nuance, from casual warmth to polite formality, allowing you to express yourself perfectly in any situation.

By practicing and using these expressions, you’ll not only improve your Japanese but also deepen your connection with the culture and people around you. It’s these small conversational touches that make learning so rewarding.

So, go ahead and try them out—just this once! You might find your confidence and joy in Japanese growing with every friendly exchange.