Transfer student Aoba Shunsuke arrives at Sunshine School, only to discover the premises are empty. He feels secret delight at being the first to reach the school, unaware that it is Foundation Day and a rest day for the institution. At that moment, a tall "L" (Eru) beauty named Natsumi appears before him, and the two hit it off despite Shunsuke being much smaller than her. Shunsuke's mother runs a women's apparel business, but the shop is in need of manpower. Shunsuke offers to help out at the shop but fumbles frequently because he does not know how to interact with the ladies. Eru decides to step in and assist around the shop, which pleases Shunsuke's mother. This is a romance story that shares the joys and woes of the "SL" combination between Shunsuke and Eru.