Yotsuba's adoptive father. The details surrounding her adoption remain unclear—he explains to Fuuka that he ended up caring for her while abroad, though he provides no further specifics. While he admits Yotsuba is somewhat peculiar, he can be unconventional himself. He comes across as a bit of a slacker; during the summer, he routinely works from home in just an undershirt and boxer shorts, and has apologized more than once for being "irresponsible." He works as a translator from home, although the specific languages and materials he handles are unknown. Despite any shortcomings in his parenting, Koiwai strives to be a good father to Yotsuba.
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