[Japanese-style light novel + first person + no System + school-based supernatural powers + travel between worlds + school romance]
“Yan Yu, if kissing me would destroy the world, would you still kiss me?”
After returning home, Yan Yu, a guitarist in a band who had gone to Japan to study during middle school, is told by his childhood friend that she comes from another world called the “World of Imagination,” and that she has the power to destroy the world if she kisses him.
Soon afterward, Yan Yu meets many more people from other worlds, including a cyberpunk world and a magical world. In the end, he is enrolled in a special school and becomes the key to saving the world.
What's more, the school threatens to take away his access to the music room unless he helps with the plan to save the world.
“But I just want to start a band!”
666. Needs improvement. Will update when I have time.