Aika decides to go back and stay at her parents' home so she and her family will be able to look after both her toddler and newborn baby together. Due to her crass nature as a former delinquent, her younger step-brother Takuya usually catches her in compromising situations. This started to make Takuya develop "improper" feelings to his older sister...
- Stepsister, Breast Milk, and Adulterous Sex
- Gishi to Bonyuu to Uwaki Sex