The Deadliest Star and the Seven Rules

Haruto, a high school student, is suddenly transported to a world where the VTuber Morinaka Kazaki really exists. It's a dangerous place where magical creatures called 'Hoshi' attack people. Kazaki looks like a 10-year-old, but she's incredibly strong and full of energy. After getting a weird mark on his right arm, Haruto gains the power to defeat Hoshi. Haruto starts going to school with Kazaki. But Ren, the popular kid in class, is suspicious. Ren talks to Hoshi at night, and he's actually th