Obsessed with Love, His Terminally Ill Love!

The male protagonist can't be more clean, his body and mind are unique. He really can't live without the heroine. Breathing in the heroine is like sucking air, and without the heroine, it's like not having oxygen... The female protagonist in each world is called Mi Tian and her nickname is Tiantian. The male protagonist's name also remains the same, but there is not necessarily only one male protagonist in each world. Don't substitute reality. It's purely fiction. Just treat it as a spiritual pastime. The male protagonist is very pathologically obsessed with the female protagonist. World 1 "The long-haired transfer student!" World 2 "Can tell the difference!" World 3 "Escape from the clutches of the overbearing president!" World 4 "It's still furry!"