Aob Shunsuke's translated student arrived at Sunshine School only in order to find empty premises. He was secretly glad that the first came to school, not paying attention to the fact that it was the day of the foundation and day of rest for the establishment. At that time, an oversized beauty "L" (ERU) named Natsui appeared before him, and they were held, although Shunsuke was much smaller than she. Shunsuke's mother manages women's clothing business, but the store needs workforce. Shunsuke offers to help in the store, but he is very mistaken, because he does not know how to interact with women. Era decides to intervene and help in the store, and it pleases the mother shunsuke. This is a romantic story that shares the joy and suffering of the combination "SL" between Shunsuke and Eru.