This follows the story of illustrator Okusawa Ritsu and salesman Ikegami Fumiya: They met at an old coffee shop and eventually fell in love and lived happily together: However, a misunderstanding gradually arises between Ritsu, who lives freely, and Fumiya, who is swayed by it: After a fight one winter day, Ritsu leaves the house and is involved in an accident, and loses consciousness: Upon awakening, Ritsu had lost only the memory of Fumiya: Wanting to start their relationship over from scratch, Fumiya hides the fact that he was dating Ritsu and resumes their joint life: However, Ritsu asks him to take him to a familiar place in order to regain his memory: Fumiya is reluctant, but the two of them start a "journey" to follow the trajectory of their relationship: The coffee shop where they met for the first time, the riverside road they always strolled, the places they both traveled to before dating::: Sweet memories and bittersweet memories, the time they spend together haunts Fumiya's mind: Ritsu, on the other hand, finds himself gradually becoming attracted to Fumiya while losing his memory: