Kiken na Otonari-san

Endou got into an affair with the neighbor's wife and was caught red-handed by the husband, Okumura. He apologized to Okumura and was expecting a beat-up when Okumura pushed him down instead. They ended up staying and setting up a company together. Everything looked blissful until Endou found out through Okumura's ex-lover that, Okumura might be cheating on him. What would Endou do? (Source: Attractive Fascinante)