After going home with his lover to meet his chubby schoolgirl sister Akari, the boy began to have feelings for her because of her cuteness and charm that was no less attractive than her sister. On a heavy rainy night, because she forgot to bring a raincoat when she came home from school, she had to stop by her brother's house to shelter temporarily, but only her boyfriend was at home and her sister could not go home due to heavy rain. Because she was afraid of thunder, as soon as she entered the house, she hurriedly knelt down and hugged his feet because of the violent thunder, revealing the seductive curves in the wet white schoolgirl dress. Unable to control himself at that image, he pressed her on the sofa and began to satisfy his desires even though at first she was shy and moaning and begging. It didn't stop there, since then she often had a craving for sex, so she took the opportunity to go on a business trip for 3 days and continue to sneak home with him - her fiancé.