

Teenage math whiz Kenji Koiso agrees to take a summer job at the Nagano hometown of his crush, Natsuki. When he arrives, he finds that her family have reunited to celebrate the 90th birthday of their matriarch. His job: pretend to be Natsuki's fiancé. Meanwhile, his attempt to solve a mathematical equation causes a parallel world's collision with Earth.

Ryunosuke Kamiki

Hitomi Miyauchi

Mitsuki Tanimura

Sumiko Fuji

Ayumu Saito

Takahiro Yokokawa

Kiyomi Tanigawa

Mutsumi Sasaki

Mieko Nobusawa

Takuya Kirimoto

Sakiko Tamagawa

Ichiro Nagai

Takashi Kobayashi

Yutaka Shimizu

Kaori Yamagata

Tagame Tamura

Tadashi Nakamura

Yoji Tanaka

Hashiya Nakamura

Mitsutaka Itakura

Eiko Kanazawa

Chigusa Takaku

Riisa Naka

Naoto Adachi

Rikito Ota

Yuki Imai

Sumire Morohoshi

Hinano Minagawa