On the day of their high school graduation, Makoto Kusakabe, a young man standing 165 centimeters tall, confesses his feelings to his classmate Hijiri Tohyama, a popular and kind boy who towers at 185 centimeters. Makoto has admired Hijiri from afar for a long time and expects his confession to be rejected, but to his surprise, Hijiri says yes. The story follows the couple after they have graduated and become university students, chronicling their gradually deepening relationship as they navigate first-time experiences together: their first part-time job, their first selfish request, their first trip, and the small moments of everyday life that become precious. The manga focuses on the warm, happy days of this height-difference couple as they learn more about each other and grow closer, showing how their initial admiration transforms into a solid, affectionate bond.