For all the people who dont want to wait.
Small spoiler:
Big spoiler:
The protagonists of the new story are exact carbon copies of Kotoka and the sister so dont bother.
Small spoiler:
yes happy end
Kotoka enforces a fetish ban to further their relationship, but because Tatsu cant endure it they break up despite loving each other. While depressed Tatsu basically seduces his boss-lady but because japanes men dont have sex nothing happens. On a visit home his childhood friend confesses to him but he rejects her, telling her he loves kotoko. He goes home to see her and sexy time in ch66. Later Tatsu proposes to Kotoka and she cuts her hair off to make sure he still loves her. Everything is fine and happy end.