Four people are discovered brutally murdered in an up-scale high-rise apartment. All the victims appear to be family, but as the investigation deepens it is discovered that one of the victims isn't related to the family.

Takehiro Murata
as Ishikawa, Police

Ryo Kase
as Yuji Yashiro

Toshie Negishi
as Satoko Sunagawa

Saki Terashima
as Nobuko Katakura

Takuro Atsuki
as Takahiro Koito

Wakaba Irie
as

Ittoku Kishibe
as Caretaker

Tokie Hidari
as Toshiko Takarai

Kyūsaku Shimada
as

Shin'ya Ohwada
as Yoshio Sato