Mahou no Tsukaikata魔法のつかいかた; Mahou no Tsukai Kata

I'm a sorcerer's apprentice. Izumi Taro, a witch, kidnapped me from Hitogoroshi and asked me to live with him. But Taro Izumi has probably killed someone before... Sakae Kusama's first full-length series, depicting the cool and gentle days of a useless adult and a lonely child, opens!