Rintarou and Kiyo are childhood friends from kindergarten. Rintarou was initially troubled by Kiyo's sudden confession, but after Kiyo left to study abroad in England, Rintarou started to see him as a possible romantic partner. Now, four years have passed and Rintarou is a child-caretaker, while Kiyo has just returned as a new professional soccer player. Rintarou is uneasy about all the changes that have occurred to them both while separated, but Kiyo tells him that "for this whole time, the only one I've liked is you"...

The heroine wakes up on the morning of August 1 and discovers she has absolutely no memories of the past. A boy appears before her, and he introduces himself as a “spirit” named Orion. The heroine struggles to regain her memories under the guidance of Orion. She then gets a phone call, but she does not recognize the name on her mobile phone screen. She meets her apparent “boyfriend,” despite not knowing his face.