Shounen-in Ushijima-kun

A spin-off exploring Ushijima's history focuses on Kaoru Ushijima during his second year of junior high, before his involvement with black finance. After a confrontation with the three Wanido siblings, he strikes Sanzo with a metal bat. Charged with assault, he is sent to a juvenile detention facility. The story examines Ushijima's experiences and reflections during his initial stay in such an institution.