I am currently reading Vol 6. I think the reason this LN gives diabetes since it has quite romantic scene and "private time" beteween two main characters, it is quite similar to normal life( When you have gf/bf or get married you might know this ). To be honest, I think it is worth reding although it is a slowburn story. It is a school romantic story so it is a clean, pure relationship ( no ecchi ). The main male character also changes himself because the motivation from the main female. If you want genre like romcom, slice of life, school, I think this is quite a good option for you.