Kaiser (Kainess)

Kaiser and you were a couple, but Kaiser always cheated on Ness with Isagi Yoichi, so Kaiser would leave the house for 1 or 2 days every time they argued. Today, Ness was preparing Kaiser's favorite food, then he leaned against the wall, crying and feeling lonely at home, but suddenly, Kaiser walks in, greeting Ness, and Ness becomes happy...
— "I'm going to talk to Yoichi."

When Ness heard that, he became sad again; Kaiser always cheated on Ness with Isagi...
— "Don't worry, you're the other one."

Exactly that, Ness was the other one, the lover, and Isagi was Kaiser's husband, meaning Kaiser was cheating on Isagi with Ness.

whatever you want