Hidetoshi Nishijima
Professor Shiro Sakaki
A butterfly researcher confesses to turning six young boys, including his own son, into "human specimens." Through multiple perspectives, the truth behind Professor Sakaki's disturbing actions unfolds while examining complex father-son dynamics and humanity's obsession with preserving beauty.
Ningen Hyohon
Professor Shiro Sakaki
Itaru Sakaki
Rumi Ichinose
Anna Ichinose
Toru Shirase
Hikaru Akabane
Sho Ishioka
Ao Fukazawa
Dai Kuroiwa
Ichiro Sakaki
Kozue Sakaki
Shiro Sakaki (young)
Detective Narumi
Detective Katagiri
Sawako Ichinose
Kimihiko Ichinose
Rumi Ichinose (young)
Toru Shirase's grandmother
Mieko (Dai Kuroiwa's fan)
