Production Companies: Madhouse , Nippon Television Network Corporation , KADOKAWA Shoten , D.N. Dream Partners , Warner Bros. Japan , Yomiuri Telecasting Corporation , VAP , Studio Chizu .
Overview: 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.
, Nippon Television Network Corporation 
, KADOKAWA Shoten 
, D.N. Dream Partners , Warner Bros. Japan 
, Yomiuri Telecasting Corporation 
, VAP 
, Studio Chizu 
.
