やるせない describes a deep, helpless sadness or emotional frustration that has nowhere to go. In the chorus, “やるせない日々” means “days filled with this unbearable, unresolved feeling,” making it a memorable word for the song’s conflicted relationship.
Natori is singing to someone he knows is bad for him, and the song is built around that word Overdose. It opens with "本当は分かっていた" (Honestly, I knew all along) and admits "いけないことだったって 分かっていたのに" (I knew it was wrong, and still). His excuse is a lovely one: "この手をすり抜ける全部が愛に見えたの" (everything slipping through my hands looked like love). Then comes the plan for dealing with it, which is no plan at all: "飲んで 吐いて 全部忘れちゃえ" (drink, throw up, just forget all of it). The ending ちゃえ is casual Japanese for "just go ahead and do it", and it makes the line sound almost cheerful.
The chorus is where I'm hooked. "Overdose 君とふたり やるせない日々" (overdose, just you and me, hopeless days), followed by "解像度の悪い夢を見たい" (I want to have a low-resolution dream). Wanting a blurry, low-res dream is such a modern way to say he'd rather not see things clearly. He also calls the whole thing "甘いハッタリ" (a sweet bluff); ハッタリ means a bluff or a big front you put on. The second verse turns darker with "傷んで腐っていく あの甘い果実のように 僕ら 壊れていく" (like that sweet fruit going bruised and rotten, we're falling apart). By the end he gives in completely: "けど 変に間の悪い嘘でもいいから" (but even an awkwardly timed lie would be fine), after hating those same lies a few lines earlier. That flip is the whole song.
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