Naruto: All My Targets Are Ninjutsu.

He traveled to Konoha and arrived on the eve of the Third Shinobi World War.
Fortunately, the "Ninja World Galgame System" was awakened.
Yu Mikami, who initially thought he could enter a carefree life with the system's help, discovers that his target for romance is a bit strange...
"Yu, why is your ninjutsu so much more powerful than others?"
"Well... you should chat with the ninja more to increase its affection level, occasionally give it gifts, then have a special interaction with it on a special holiday, and finally confess your feelings to it during a mysterious event in its heart. Once the ninja agrees to be with you, you can master the art of ninjutsu!"
"Why don't you believe me? That's exactly how it is in Ga La Ge Mu Li!"
Sigrún has taught at the Iceland University of the Arts as a part-time lecturer since [-] and was Dean of the Department of Fine Art from [-]-[-]. In [-]–[-] she held a research position at Reykjavík Art Museum focusing on the role of women in Icelandic art. She studied fine art at the Icelandic College of Arts and Crafts and at Pratt Institute, New York, and holds BA and MA degrees in art history and philosophy from the University of Iceland. Sigrún lives and works in Iceland.
This book is also known as "100 Ninja Techniques That Make Me Love You So Much".