1/2

The production has a rough, endearing scrappiness to it — acoustic guitar strummed with youthful imprecision, a drum pattern that feels slightly rushed as though the song cannot quite contain its own excitement, backing vocals that pile in with cheerful inexactness. Makoto Kawamoto's voice is not polished in the conventional sense; it has a slightly abraded texture, earnest in a way that trained vocalists sometimes forget to be, and that rawness is entirely the point. The song became famous as an anime ending theme but it transcends that association: it is really a late-1990s indie-pop document about the arithmetic of early love, the idea that two incomplete people discover they are each other's missing fraction. There is something almost math-anxious in the concept that becomes genuinely moving in execution — the simplicity of the metaphor treated with complete emotional seriousness. The melody is immediately memorable but never predictable, with small rhythmic hiccups that keep it from feeling too tidy. Play this when you are young or when you want to remember being young, on a spring afternoon with the window open, at the exact age when you still believed love could complete an equation.