With graduation on the horizon, pure-hearted Kumai only has one thing in mind: to get a girlfriend. He has struggled to put himself out there due to a past heartbreak, but seeing all his fellow classmates beginning relationships has finally motivated him to take a step forward. Kumai decides to shoot his shot with a mutual acquaintance over a text message, and to his delight, she agrees to meet up. They plan a lunch date for the very next day.

However, when the day arrives, Kumai is shocked to find that the person who shows up is not the girl he was texting, but Sasahara, the hottest and most popular guy in school. Even more confusing, Sasahara begins acting as if the two of them are dating, throwing Kumai into a state of complete bewilderment. This misunderstanding, rooted in a text message gone wrong, forces Kumai to navigate a completely unexpected romantic situation.

The main character, Kumai, is a late bloomer whose past heartbreak has made him cautious about romance. Sasahara, by contrast, is described as a super hottie whose intentions and actions drive the central conflict of the story. The manga is a coming-of-age romance set against the backdrop of the final days of the school year, with graduation looming as a reminder of changing relationships and new beginnings. The narrative focuses on the awkward and often humorous fallout of their initial mistaken encounter, exploring how two people who never expected to be paired together navigate the surprising dynamic that unfolds between them.