【Intel mandarin】Cuckold Flashback

The protagonist, an otaku, has a girlfriend, Mika, the number one sports beauty in the academy.
She forbids sex until she competes in the national tournament.
He was dedicated to his training.

All this to counteract the memory of that abominable man.
To win the glory that was stolen from me…
But her efforts proved to be counterproductive.
But her efforts backfire and create a huge gap.
She had a flashback of that [memory] that must not be recalled.
It was not possible to resist it…

30 page manga