Naruto: All My Targets Are Ninjutsu

Transported to Konoha just before the outbreak of the Third Shinobi World War, Yū Mikami awakens a mysterious Shinobi Galgame System. The system was supposed to make life easy. There was just one problem. His romance targets weren't girls. They were ninjutsu. To master a technique, he has to chat with it, raise its affection, give it presents, unlock special events, and even confess to it. The stronger the bond, the stronger the jutsu. While everyone else is training day and night, Yū is busy dating fireballs, befriending shadow clones, and trying to understand the feelings of chakra itself. In the ninja world, no one understands what he's talking about. And somehow, that's exactly why he's becoming ridiculously overpowered.