Prequel to Chou to Hana no Kankeisei.
Backstory of Hitohira Chouno's (Womb tattoo guy) past when his life suddenly took turn for worst after his mother died during his middle school & his kind hearted, caring uncle (mother's lover), Kumoi started changing. This change was triggered when Hitohira told his uncle will move out as soon as he graduates. How a parental love changed into something obsessive & dark is told in this twisted tale.