• Book Name: Kono Kankei wa Gouhou Desu! Manga
• Alternative(s): This Relationship is Legal!
• Genre(s): Romance Comedy
• Author(s): Aka Chihiro
• Year 2023
• Status: Ongoing Download Manga
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Summary: YES Sister, NO Touch! Kouta, who is extremely siscon, decides to live alone in order to \"escape from his little sister \". One day, however, he picks up a runaway girl named Ui, who is full of younger sisterly feelings. Although she looks and acts like a child, she is in fact a beautiful 19-year-old girl with big tits! Protect his sister? or Crossing the line? The days of agony begin!