Say I Love You. Vol. 3 (Kodansha, 2014)

It's hard for the onceloner Mei to believe that she's been going out with Yamato for six whole months! He's taught her a lot about how sweet love can be, but now she's about to learn a new lesson: Love can be war! When a serious rival arises for Yamato's affections (and a roundhouse kick isn't an option), how will Mei handle it? Let the battle begin!