Hatsu*haru Vol. 2 (manga)

After things on the school camping trip don't go his way, Kai's left dumped and convinced he's better off just giving up on girls and dating altogether. Yet somehow his friends rope him into a group date, and he ends up at the amusement park with...Riko!? But when Suwa-sensei turns up at the same park with another woman, will Kai be able to hide what he saw and protect Riko from experiencing heartbreak like he has?