Koiwai, Yousuke
Summary
Yotsuba’s adoptive father, Koiwai, remains somewhat of a mystery regarding the origins of her adoption. He vaguely explains to Fuuka that he ended up caring for her while he was abroad, though he offers no further specifics. Although he recognizes Yotsuba’s eccentricities, he shares her offbeat nature. Koiwai is portrayed as a slacker who often works from home in just an undershirt and boxer shorts during the summer, and he frequently apologizes for being irresponsible. He makes a living as a translator, although the specific languages and materials he handles are never specified. Despite his unconventional lifestyle, he genuinely strives to be a good father to Yotsuba.
