When regular salaryman Yoshida wakes up a Sunday morning following a very long night in the bar, the last thing he hopes to see is his small apartment includes a brand new resident–an unfamiliar high school woman.The preceding night, despite ultimately gathering the courage to admit to his boss and longtime crush, Airi Gotou, Yoshida has been refused. After drowning his sorrows in a bar with his great friend Hashimoto, Yoshida led back to his house in a drunken stupor, only to rush into Sayu Ogiwara, a runaway high schooler. Now, with his head straight but with no memory of past night’s events, Yoshida has Sayu clarify how she ended up sleeping in his apartment. Having listened to her narrative, Yoshida finds himself not able to kick out her –particularly after learning that she arrived all the way in Hokkaido! Therefore, despite his reservations concerning sheltering an underage woman, Yoshida enables her to remain, as well as their life together starts.