At the age of twenty-nine, Kurose Kazumi earns his living as a programmer for an eroge company. He is well-versed in galge, having had plenty of experience playing them in his youth. However, Kazumi never had any attraction towards younger girls. That is, until he meets a middle-schooler who declares that she cannot date him. Despite her clear statement, Kazumi finds himself drawn to her adorable nature and feels a strong desire to have her in his life.