Mou Kimi wo Matanai

Takashi and Chizuka's relatioinship seems to be sailing smoothly, then suddenly Naruse, Takashi's ex and Tsutsumi's cousin, shows up at the same time as Chizuka's first love. It's a battle to control their jealousy as their exes seek to take back their previous lovers. Will they keep their relationship afloat or will they fall apart?