28-year-old OL Yamada photon (Snow Kishii is acted the role of) for the man who fell in love at first sight five months ago (Narita Ling is acted the role of), put his work and friends all behind, even if he is unemployed, even if he is treated coldly by his friends, as long as he can be around him, he feels happy, but for Shou, Photon is just a girl who contacts casually. For this unchangeable unrequited love, Photon makes an unexpected decision. The film is adapted from Tian Guangdai's novel of the same name.