1: Amagi No Longer

An alternate universe in which instead of Aira, Eichi found Hiiro first after he got disowned by Rinne.

In this version, Eichi is basically using Hiiro as a way to get revenge on his ex, Rinne. At first, he only coerced Hiiro into sleeping with him, but slowly, he wanted an actual relationship with him.

So, during Hiiro's breakdown, he decided to take the chance to manipulate Hiiro into becoming his boyfriend.