セブンティーン Seventeen

As if it were a mirror image...

かのような means “as if,” giving the opening a slightly unreal edge.

...in a world that is exactly alike.

瓜二つ is an idiom for being nearly identical, often used for faces or family resemblance.

Two versions of me were born there, one in each world.

The phrase 二人の私 is the key conceptual twist: literally “two me’s.”

Were we simply placed where we were meant to be differently?

在るべき has a slightly literary “where one ought to be,” not just plain location.

Or did God make a mistake?

A direct theological question, but stated in plain language rather than elevated diction.

The same outward form, but inside, complete opposites.

真反対 is strong: completely opposite, not just somewhat different.

This sense of wrongness, apparently...

違和感 is the feeling that something is off or does not fit, emotionally or perceptually.

...had been growing for a long time already.

〜てた is the spoken contraction of 〜ていた, keeping the line emotionally immediate.

I do care about both Dad and Mom.

This line matters because it keeps the conflict from sounding like simple rejection or dislike.

But I, apparently...

The repetition of どうやら keeps the self-diagnosis tentative but inescapable.

...because here, I am not really myself.

じゃない is colloquial, but the claim itself is very strong and categorical.

Red returns to red, black returns to black.

The imagery is compressed. The wording suggests separation back into distinct sides or identities.

In the world on the other side, divided by dimensions...

向こう側 is “the other side,” and 隔てた emphasizes separation, not just difference.

Even today, a cruel devil is crying out there.

だって gives emphasis: even today, still. The unreal image matters because it frames the speaker's choice as morally urgent, not merely sentimental.

The me over there is timid and a crybaby.

泣き虫 is colloquial and childlike, which makes the line feel unusually tender.

Because I cannot pretend not to see.

見て見ぬ振り is a set phrase: to act as if one had not noticed.

At this rate, it will not become a happy ending.

〜とはいかない means something cannot simply work out that way.

Then I’ll go save your world.

The line is abrupt. 救いに行く is literally “go in order to save,” using motion plus purpose very directly.

Forgive a rough, reckless me like this.

乱暴 can be rough, violent, reckless, or blunt. It frames the coming action as morally disruptive, not purely noble.

Because I know I will see it through.

やり遂げる means to carry something through to completion. It is more forceful than just “do.”

This is not something like a bad ending.

なんかじゃない pushes back against a label with emotion: “don’t call this merely that.”

Wherever I may be, I...

〜としても is a concessive pattern: even if that were the case.

Yes, in this world I am a one-and-only original.

The English loanword オリジナル works well here because identity itself is being argued for.

I would be happy if you could think of me with pride.

〜てくれたら嬉しい is a soft way to express hope about someone else’s action.

In the world on this side, split apart by the boundary line...

こちら側 contrasts with the earlier 向こう側. The song now flips perspective to the other world.

Even today, a carefree angel yawns here.

The mirror structure matters: earlier it was a cruel devil; here it is an easygoing angel.

Because once I noticed the evil, I could not let it pass.

気付いてしまった suggests an irreversible realization. 見逃せない is “cannot let slide” or “cannot overlook.”

Let’s exchange our ways home.

交換しよう is volitional: “let’s exchange.” The wording is simple, but it carries the whole parallel-world premise.

I will become hope.

This is a strikingly direct claim. The noun 希望 gives the line strong moral weight.

Parting is a little sad, but...

けれど keeps the sentence emotionally open, softening the sadness without canceling it.

Even the scar once made at the corner of the eye...

The image is physically concrete. Pain is described as leaving visible marks rather than remaining abstract.

...because it is proof that I stood up against the unreasonable.

理不尽 is unfairness or unreasonable cruelty. The scar becomes evidence of resistance, not just damage.

Until someday it becomes a happy ending...

This answers earlier fear directly. The wording reframes the situation as unfinished rather than final.

...I will fight the world itself.

相手に means “against” or “with as opponent.” It makes the scale of the struggle feel enormous.

A rough me like this, all this time...

This reaches back to earlier self-description, but now the same area of language is used more positively.

Thank you for loving me.

〜てくれてありがとう is intimate and direct. It turns the parallel-self relationship openly affectionate.

This is not something like a bad ending.

The repeated line comes back with more conviction after the vow and the gratitude.

Wherever I may be, I...

The repetition strengthens the song’s insistence on selfhood across worlds.

I am your one-and-only original.

唯一無二 means unique, without equal. The line sharpens the bond from abstract identity to personal singularity.

I will live proudly.

The promise is no longer just to save or fight, but to live in a way worthy of the bond.

Come on, let’s return to where we ought to be.

The volitional 帰ろう makes the return feel chosen, not imposed.

Seventeen said goodbye.

By the end, the title can be heard as referring not just to age, but also to a whole stage of life and identity.