Seiichi Tsukishima

Seiichi Tsukishima is a longtime friend of main character Togo Sakurakado and holds the position of library committee member at their school. In everyday situations, he comes across as a grumbling, gloomy, and thoroughly negative otaku. However, the moment he steps into the library or finds himself surrounded by books, he undergoes a dramatic transformation into a smooth-talking, flirtatious charmer. This stark Jekyll-and-Hyde contrast frequently draws exasperated reactions from those around him, and his scheming nature combined with his split personality makes him a highly memorable recurring supporting character throughout the series.