Issei's Gamer Life was harder than he expected

Issei woke up to the option to attain [The Gamer] ability, he of course accepted. However when the tutorial consisted of a battle against the depreciating dark version of himself... Issei decides to get serious and live a life that he can be proud off. Spoilers for F/SN and many series. Discontinued, it was my first fanfic so clearly there were way too many unplanned moments to fix