Why did the girl have to lose her memory?

Tomohisa Yamas...

as

Narumi Saku

Fumino Kimura

as

Abiko Miori

Yōsuke Asari

as

Abiko Kento

Konomi Watanabe

as

Nao

Kazuki Namioka

as

Nakazawa Wataru

Tsukaji Muga

as

Ando Jiro

Takehiro Kimoto

as

Konno Minoru

Yasuhi Nakamura

as

Seta Koji

Nakano Haruto

as

Seda Hiroshi

Mari Hoshino

as

Seta Aiko

Eiichiro Funak...

as

Yagami Keisuke