Choose the world or choose the girl?

Shiraishi Gomichi, an ordinary high school boy, has a “secret." He has memories of a previous life. He was a "hero" who defended mankind in another world, very different from this one. However, that was all in his past life. In this life, he was supposed to be just a normal student, until a new girl, Mai Shiina, comes into his life.

"I can't live without you!" The boy who was once a hero and the girl who can't be honest about her feelings, in a grand romantic comedy!

(Source: Pocket Comics, translated)