Kiraboshi Dial

Toba Yousuke sensei went to Town Alp to start afresh. He got lost and met a strange guy, Suga Kazuhiro, who went to pick him up. The folks in the town were extremely friendly, except for Kazuhiro. Because his room in the clinic collasped, Toba had to stay in Kazuhiro's huge house for a while. What were the reasons behind Kazuhiro's personality?...