On sweltering summer days, Nanako grew tired and decided to wear a swimsuit around the house to stay comfortable. Innocent and pure, she freely shows off her gorgeous body while diligently doing housework. Despite knowing she's my sister, I can't suppress the growing heat in my groin whenever she playfully reaches out to tease me. This summer promises to be a meltingly hot season, completely enveloped by her irresistible charm.