I don't like this. This MC is clearly here just to fuck. If he was with a girl he actually loves, instead of constantly thinking "I'm going to graduate", he would think "I want her now".
He seems more and more like a selfish douchebag that prioritise losing his virginity above anything else.
"between 20% and 40% of Japanese men have paid for sex." (Quote from Wikipedia)
There, found a solution for him to "Graduate" without hurting anybody.
Yeah he want's to fuck.. but he wants to fuck ayame. there are 3 girls. the loli big tits, the sadist small hills and my favorite brown gyaru.. they want to fuck doggy but doggy refuses.
This and Kanojo, Okarishimasu are literally the same thing except this one is in highschool and it's taking itself a little less seriously, thankfully. Both protagonists still need to be shot in the fucking head though.