Kosaku Okano

as Yu's grandfather

as Professor Karube

as Professor Takashi Yabe

as Researcher

as Detective

as Ichimatsu

as Bodyguard

as Tanaka Mitsuaki

as Nakamura

as Stadium guest B

as Nakamura

as Detective Tonami

as Secretary Kubo

as Reporter A

as Kiyomura Construction employee

as Driver

as Shigeo

as Yamamoto's subordinate