His and Her Chemical Reaction

You could say kogals are honor students in the school of lovemaking...

Delinquent Girl + Good Boy = (Mostly) Good Ending
Good Girl + Delinquent Boy = (mostly) Bad Ending

Hinasaki is excellent. Only downside most works one and dones. So many could easily have sequels. Still love all this vanilla goodness.

This one is really sweet I like it

"For a virgin, you really know how to restrain yourself." Hnnn.. "Here! Touch my boobs!" ...Release Level 1 Restraints...

What's better than a kogal? A cute vanilla kogal.

Kogal love <3.

Kogal!

Love the underwear!

I love cute Kogals! :D

I've got to say that on top of her being really hot and awesome in general, she has some awesome underwear.

She used a petri dish as an ashtray? She's damn lucky it wasn't something flammable.

Okay good. They didn't forget the Vanilla this time.

Getting a kogal sex friend (upgrade to girlfriend) who can be Violently Protective if or when required - especially if you stood up for her - Keita-kun, you've scored the SUPER JACKPOT ... you Lucky Bastard (grr).

Mine and Her Chemical Romance

The chemical reaction that creates some sweet, sweet Vanilla...
I have to say this protagonist is quite the nice guy though. He agrees to help teach a girl he just met, and when she was being bothered by some guy, he stood up to him.
Also, "Through some sort of miracle"? It was no miracle at all, because sex in Hentai solves just about every problem, and that includes tests and studies.
That ending though. I suppose the correct reply would have been "I'll tutor you to make sure that happens", or something?

All about chemistry
Won't you show me everything you know
Ah wonder what you do to me
Oh-oh-oh-oh-oh, oh
All about chemistry
Won't you show me everything you've learned
I'll memorize everything you do to me so I can
Teach it when it comes my turn