Shiromi Hanako, also known as "Test Subject 4901" escaped the orphanage that she lived in... Shiromi met two boys called "Akio Watanabe" and "Kanda Ryoko" they were the first people she encountered in the outside world... Then, Kanda and Akio ran away from their home just so they could take care of Shiromi as their sister. Soon the three were taken in by an old Yakuza leader... The three children grew up with two more children called "Kai Chisaki" and "Kurono Hari" Kurono Hari x OC Kai Chisaki x OC Nine x OC ??? X OC
9 parts