My Girl Group Girlfriend

During school holidays, I'll update once or twice a day. When school is in session, I can only update on weekends, so I hope you'll bear with me. This book will have a crossover with another one, which will be mentioned in the story.

[This is a story about a highly intelligent boy who's in a very strange and childish state of mind, and a girl who finds his childishness and odd state of mind annoying but still looks after him. They accompany and help each other grow. Though they face setbacks along the way, they continue to stay by each other's side.]

(Please note in advance that this is a parallel world, so don't conflate it with the real world. The timeline in the parallel world is different from ours.)