(Holy Armor: This book is set in a modern Tokyo worldview, involving MyGO, I recommend, Lonely Rock, etc. It is also a harem story with a male protagonist, so please do not read if you don't like it.)

Lu Yu, seventeen years old, is handsome and has excellent character and academic performance.

After traveling to a hodgepodge of Tokyo-style anime, Ruyu obtained a system that can train heroines from various worldviews to become masters in the field of music and help them solve their problems.

Thus, Lu Yu began his journey to become a gold medal mentor.

Hoshino Ai, Toyokawa Shoko, Goto Ichiri...

With Lu Yu's help, one girl after another overcame difficulties and achieved success. However, when the girls became successful and wanted to repay him, he had already hidden his fame and left quietly to go to the next heroine.

"You said I was the best idol in the world, so why did you leave?"

"We agreed to be in a band for life, how could we allow you to escape?"

"I won't let you escape. Even if I have to chase you to the ends of the earth, I will find you!"

Lu Yu: “???”

It's just a system task, don't take it seriously.

Starting in kindergarten, I met Yukinoshita, Hayasaka Ai, and the Kotori sisters... [Male protagonist, multiple female protagonists, daily story] Good news: I was killed by a dump truck, but I traveled through time. Bad news: I traveled through time as a five-year-old. —My name is Gen Chiye, and I'm currently in the last year of kindergarten. Although my body has shrunk, I'm not panicking at all. This is because my system has a "God's perspective." Under certain conditions, I can observe others, defying the laws of physics. Furthermore, I can bind to others. Any power-ups they gain through their hard work will be shared with me. Knowing this, the next step is simple... (This story blends the worldviews of several popular youth anime series, with detailed descriptions of each major character. Even those unfamiliar with the original works can easily read it as an original story.)

On the app called FreeFriends, he met Saki Kawasaki, a woman short of money due to a family change. On the train, he encountered Kotonoha Katsura, a cowardly girl who was bullied at school. He became a model and met Kirino Kousaka, a girl who loved the anime. From that month on, Yuu Kasugano's youth was no longer normal.