Anyway, I'm Falling In Love With You. manga volume 6 features story and art by Haruka Mitsui.

During a camping trip held to send off Shuugo's brother, Tougo, who finished his student teacher practicum, Shin makes the bold move to kiss Mizuho! Having decided not to keep his feelings under wraps any longer, Shin declares himself to be Kizuki's rival in love. How will Mizuho handle Shin's earnest advances when she never had an inkling he liked her that way before?!