After being fired from his company due to his violent temperament, Takehisa returns to his family home for the first time in 7 years. He finds that his previously angelic little brother, Rio, who used to adore him, has grown into a handsome and intelligent but devious person. While somewhat contemptuous towards his older brother, the two manage to coexist for the most part. That is until Takehisa sees his brother having a sexual encounter with a random man in a park restroom...
 
(Source: KOOI., translated)
 
Note: Includes one extra chapter.

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