When transfer student Aoba Shunsuke arrives at Sunshine School, he discovers the campus deserted, a sight that fills him with secret delight until he realizes it is Foundation Day and the school is closed. Just then, the towering beauty Natsumi, known as Eru, appears, and despite the stark height difference, the pair quickly bonds. Meanwhile, Shunsuke’s mother, who manages a women’s clothing business, is struggling with a shortage of staff. Shunsuke attempts to assist in the shop but struggles to connect with the female customers. Eru steps in to help, earning the approval of Shunsuke’s mother. The narrative follows the romantic journey of this unconventional SL couple, highlighting both the happiness and difficulties they encounter together.