The Girl I Saved on the Train Turned Out to Be My Childhood Friend, Vol. 5 (manga) — Kennoji

What was supposed to be a fun barbecue quickly turns sour when Hina overhears Ryou and Shinohara talking about their history together. It's up to Ryou to sort out this misunderstanding before it hurts his relationship with his childhood friend, but the girls just can't seem to get back into high spirits…though Mana has the perfect plan to change that! Meanwhile, Hina is ready to make a move of her own -- but what could it be?!