Aoba Shunsuke, a transfer student, arrived at Sunshine School but found it deserted due to Foundation Day being a rest day for the school. Despite this, he was thrilled to be the first one there and unaware of the holiday. Suddenly, Natsumi, an "L" (Eru) beauty, appeared before him, and they quickly bonded despite Shunsuke's smaller size. His mother owns a women's clothing business but needs help managing it. Shunsuke offers to assist, but struggles because he lacks experience interacting with ladies. Natsumi steps in to lend a hand, pleasing Shunsuke's mother. This is a romance story that highlights the challenges and joys of the "SL" (Small-Large) dynamic between Shunsuke and Natsumi.
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