The Girl I Saved on the Train Turned Out to Be My Childhood Friend, Vol. 3 (manga)

Ryou and Hina's relationship is moving steadily along, and now they've already gone on their first date. But Torigoe still has one last card to play-a confession of love! Choosing between his beloved childhood friend and his only comrade at school is enough to make any boy's head spin... Ryou's got a tough decision to make, and he'd better make it quick-because, as it turns out, Hina heard everything!