My Dearest Self with Malice Aforethought volume 4

After the arrest of Yashiro Sai and the violent organization, SKALL, the curtains drop on the female university student's murder case. Because of this case, Eiji decided to reveal the truth of his dissociative identity disorder to Kyoka and she agreed to work with him to investigate the mysteries of B1. Not only did they find nothing about B1, but Eiji discovered that Kyoka's past was shrouded in mystery... That's when Eiji decided to dig up the truth behind Kyoka's upbringing...