Okage de and Sei de: Thanks To and Because Of in Japanese

Japanese separates causes by how you feel about the result. A good outcome is okage de, thanks to. A bad one is sei de, because of, and it points a finger.

A student bowing to a teacher after passing an exam
What you need to know

Okage de and Sei de: Thanks To and Because Of in Japanese

English because of covers good and bad results alike, but Japanese usually picks a side. Okage de credits a cause for something good and carries gratitude. Sei de blames a cause for something bad. Both attach to nouns and clauses in the same way, and both have set phrases worth knowing: okagesama de as a polite reply, ki no sei for it's just your imagination, and sei ni suru for blaming someone. At work, blame language can sound like an excuse, so this guide also covers the neutral alternatives.

Okage de credits a cause for a good result and carries thanks

Sei de blames a cause for a bad result

Okagesama de is a polite reply that does not need a specific helper

At work, tame and no eikyō de describe causes without blaming

Credit on one side, blame on the other

Okage comes from the idea of shade and protection, and okage de still carries a feeling of being helped. Use it when a cause led to something you are glad about.

Sei means fault. Sei de names a cause for something unwanted, and it tends to sound like blame, especially when the cause is a person.

JapaneseRomajiMeaning
先生のおかげで合格しました。Sensei no okage de gōkaku shimashita.I passed thanks to my teacher.
雨のせいで試合が中止になった。Ame no sei de shiai ga chūshi ni natta.The game was cancelled because of the rain.
皆さんのおかげです。Minasan no okage desu.It is all thanks to everyone.

How both attach

Okage and sei are nouns, so they attach the way nouns do: no after a noun, na after a na-adjective, and the plain form after verbs and i-adjectives. Add de to link to the result, or desu to end the sentence.

JapaneseRomajiMeaning
薬を飲んだおかげで、よく眠れました。Kusuri o nonda okage de, yoku nemuremashita.Thanks to the medicine, I slept well.
寝不足のせいで、頭が痛いです。Nebusoku no sei de, atama ga itai desu.My head hurts from lack of sleep.
部屋が静かなおかげで、集中できます。Heya ga shizuka na okage de, shūchū dekimasu.The quiet room lets me concentrate.
道が狭いせいで、よく渋滞します。Michi ga semai sei de, yoku jūtai shimasu.The narrow road often causes traffic jams.
Before okage or seiForm to useExample sense
NounNoun plus noThanks to the teacher, because of the rain
VerbPlain form, often pastBecause I took the medicine
i-adjectivePlain formBecause the road is narrow
na-adjectiveAdjective plus naBecause the room is quiet

Okagesama de: the polite reply

Okagesama de is a fixed polite expression used when someone asks after your health, your work or an event. It means roughly thanks to you and everyone, and it expresses general gratitude rather than crediting the listener for something specific.

It sounds warm and a little formal, which is why it is so common with neighbours, older people, clients and people you have not seen in a while.

JapaneseRomajiMeaning
おかげさまで、元気にしています。Okagesama de, genki ni shite imasu.I am doing well, thank you.
おかげさまで、無事に終わりました。Okagesama de, buji ni owarimashita.It went smoothly, thank you.
おかげさまで、仕事にも慣れてきました。Okagesama de, shigoto ni mo narete kimashita.I am getting used to the job, thank you.

Sarcastic thanks and self-blame

Just like thanks to you in English, okage de can be turned upside down. Said with the wrong result, it becomes a pointed complaint between people who know each other well.

Sei is also the everyday word for fault. Jibun no sei desu takes responsibility, and hito no sei ni suru means blaming someone else.

JapaneseRomajiMeaning
君のおかげで、全部やり直しだよ。Kimi no okage de, zenbu yarinaoshi da yo.Thanks to you, I have to redo everything. (sarcastic)
私のせいです。すみません。Watashi no sei desu. Sumimasen.It is my fault. I am sorry.
人のせいにしないで。Hito no sei ni shinaide.Do not blame other people.

Sei ka and ki no sei

Adding ka softens the cause into a guess: maybe because. Sei ka is useful when you suspect a reason but are not sure, which is a very common way of talking about health and mood.

Ki no sei, literally the fault of your mind, means it is just your imagination. It is a friendly way to reassure someone or to doubt yourself.

JapaneseRomajiMeaning
疲れているせいか、ミスが多いです。Tsukarete iru sei ka, misu ga ōi desu.Maybe because I am tired, I am making a lot of mistakes.
年のせいか、最近目が疲れやすい。Toshi no sei ka, saikin me ga tsukareyasui.Maybe it is my age, but my eyes tire easily lately.
気のせいだよ。Ki no sei da yo.It is just your imagination.
気のせいかな。Ki no sei ka na.Maybe I imagined it.

Neutral causes at work

When you explain a delay or a problem to a manager or a customer, sei de can sound like you are shifting the blame. Neutral cause markers state the reason and move on to what you will do about it.

Tame is formal and common in announcements. No eikyō de, due to the effects of, is standard for weather and transport. Plain de works in everyday speech.

JapaneseRomajiMeaning
事故のため、電車が遅れています。Jiko no tame, densha ga okurete imasu.Due to an accident, trains are delayed.
台風の影響で、到着が遅れます。Taifū no eikyō de, tōchaku ga okuremasu.Due to the typhoon, the arrival will be late.
電車が遅れたため、十分ほど遅れます。Densha ga okureta tame, juppun hodo okuremasu.The train was delayed, so I will be about ten minutes late.
大雪で学校が休みになりました。Ōyuki de gakkō ga yasumi ni narimashita.School was closed because of heavy snow.

The other reason connectors, kara and node, have their own guide. For credit and blame, okage and sei are the ones that carry feeling.

Key points

A practical way to improve

Tell a short story about a week with ups and downs, giving one okage de and one sei de. Then run Unihongo's Call Work About a Train Delay roleplay mission and explain the delay with a neutral cause instead of sei de, and check the session report's corrections to see how your explanation came across.

  1. 1

    Choose one clear goal

    Focus each session on a situation or skill you can actually use.

  2. 2

    Practice actively

    Say complete answers aloud instead of only reading or recognizing Japanese.

  3. 3

    Review and repeat

    Keep useful corrections and revisit the same skill until it feels natural.

FAQ

Frequently asked questions

Can okage de be used for a bad result?

Only sarcastically. Kimi no okage de zenbu yarinaoshi da yo, thanks to you I have to redo everything, uses thanks to bite, exactly like the English.

What does okagesama de mean when someone asks how I am?

It is a polite way of saying I am well, with gratitude to people in general. The person asking does not need to have helped you personally.

What is ki no sei?

It is just your imagination. Ki no sei da yo reassures someone that what they noticed probably is not real, and ki no sei ka na wonders whether you imagined it.

Is sei de too strong for work?

It can sound like blaming or making excuses. For delays and problems, tame or no eikyō de state the cause neutrally.

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