KIMI MONOGATARI (キミモノガタリ)

Reach (imperative), far-away toward

Tears entrust, this door's other-side at

預ける ('to entrust / leave with someone for safekeeping') is what you do at a coat check or with a piggy-bank. Used metaphorically for leaving emotions in a particular place — checking your tears at the door.

Still haven't-seen tomorrow (subject) visits

訪れる ('to visit / call upon') is poetic when applied to abstract things — 春が訪れる ('spring arrives'), 朝が訪れる ('morning arrives'). Heavier register than 来る.

Lose-and, notice-and, scream-and, struggle

Stacking te-forms with no other connector creates a sequence that feels almost cinematic — one frame, then the next. もがく ('struggle, thrash about') is stronger than 苦しむ — physical writhing.

Song resound this road's a-little ahead (object) again is-illuminating

Tears (topic-って), happy time at, want-to-shed

Sentence-initial って (= というのは, 'as for X') is the casual way to topicalize a noun and immediately discuss it. 涙って ('as for tears...') is a soft conversational opening, like English 'tears, you know — I'd rather...'.

Clean puddle, want-to-float (nominalized) (topic) what

水たまり ('puddle' literally 'water-pool') is what's left after rain — small, mirror-like. The image: pretty puddle as the surface to float something on, like a paper boat. 浮かべる ('to float (something)') is transitive.

Rejected that-girl (topic), once even, behind (object) without-looking-back

振る ('to wave / shake') has a slang meaning: 'to reject (a romantic confession)' — from the image of waving someone away. 振った ('I rejected') is the perpetrator's perspective; 振られた ('I got rejected') is the receiver's.

Crowd by, be-swallowed-and, vanished

Passive 飲まれる ('be drunk / be swallowed') is the standard way to describe being overwhelmed by something larger — 人波に飲まれる ('swallowed by the crowd'), 雰囲気に飲まれる ('overcome by the atmosphere').

Heart's lens (object) make-cloudy (nominalized) (topic), self (subject) was-telling sigh (assertion)

ため息をつく ('to let out a sigh') uses the verb つく — same fixed pairing as 嘘をつく ('tell a lie'). The metaphor of a heart with a lens that fogs from your own breath is signature little by little tenderness.

Blink even (intensifier) regrettable scene also exists (assertion)

惜しい ('regrettable / a waste') has the nuance of 'so good you don't want to give it up'. まばたきも惜しい ('I don't even want to blink') is a stock idiom for 'unable to look away'.

Yeah, alone if, anything (intensifier) can't-do (emphatic)

But, self to win-such-as don't-do

自分に勝つ ('beat oneself') is the idiom for 'overcoming oneself / forcing through one's weakness'. 自分に勝ったりしないで = 'don't go forcing victory over yourself' — the song's gentle pushback against self-flagellation.

That-kind-of you (topic) mistake isn't (assertion)