Misumai Youshin, a shy and introverted high school student whose hobbies are social games and weight training, unexpectedly learns that Barato Nanami, a popular gal in his class, will confess to him as a punishment game. His social game friends advise him to take the opportunity to date her and win her over. However, it seems Nanami is already smitten with him, even before he makes any effort. This story follows their relationship as the initially reluctant Youshin navigates his unexpected romance.