Despite his youth, Minoru is an expert on Persocoms whose knowledge of which is unrivaled (possibly surpassed only by
Chitose Hibiya). He has no parents (both are presumably deceased), and his only remaining family member, his sister
Kaede, died of an illness two years before the story takes place. Minoru created
Yuzuki in
Kaede's likeness to replace the sister he lost. In addition to
Yuzuki, Minoru has also custom-built four female maid persocoms, which are dressed in rather skimpy outfits.
Minoru is also a regular user of the online Bulletin Board System (BBS) under the username "M", which is
how he met first Hideki's friend Shinbo, and then later Hideki. Minoru understands Hideki's relationship with Chii, and assists Hideki whenever possible, often meeting up with Hideki at Minoru's preferred hangout, the Duklyon Cafe.
