There's this aching piano line running through the whole thing that will absolutely wreck you by the final episode. The Day I Became a God soundtrack comes from Jun Maeda and the Key sound team, and it swings hard between bubbly comedy cues and devastating emotional payoffs.
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"Everyday" has that classic slice-of-life bounce with bright acoustic guitar, while "Kamisama Kourin" goes full celestial with layered synths and choir. Then "Takaramono ni Natta Hi" just. Breaks you. The piano arrangements strip everything back and hit so much harder than the full versions.
If you cried at Clannad or Angel Beats, keep tissues nearby because Maeda knows exactly what he's doing to your heart.