Slight spoiler warning (not really) Normally I find these stories creepy as hell. That's due to the fact that the older "Sensei" counterpart is usually male. It makes me think of the predatory nature of men. It really shows this time, as Ryo is the predatory one (not in a bad way). Honestly, the age gap isn't quite so big, I wonder why she wanted to wait until they were 20. Regardless, I flippin loved this story. It was cute, I'd totally go for a girl like sensei tbh. She's 100% my type, I get Ryo's desire to want to protect someone like her. I'm nowhite knight, but right down to her look, 100% yes.

Oh also, this manga is 100% yes, read it.