Transfer student Aoba Shunsuke arrives at Sunshine School, only to discover the premises are empty. He is secretly delighted to be the first one there, unaware that it is Foundation Day and a day off for the school. 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 needs more staff. Shunsuke offers to help out at the shop but fumbles frequently because he does not know how to interact with women. 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.