Naruto: All My Targets Are Ninjutsu

He was transported to Konoha, just before the Third Shinobi World War. Luckily, he awakened the "Ninja World Galgame System." Initially expecting a carefree life with the system's help, Mikami Yu discovered his target was a bit strange… "Yu, why are your ninjutsu so much more powerful than others?" "Well… you should talk to your ninjutsu more, increase their affection, occasionally give them gifts, have a special interaction with them on a special holiday, and finally, during a mysterious event in their heart, confess your feelings. Once they agree to be with you, you'll have mastered ninjutsu!" "Why don't you believe me? That's how it is in Konoha!"