Shiroi Hebi no Yoru

Main character is an ordinary student, but with pervert nature. He finally decides to confess to a girl, but she is attacked by some evil spirit. Protagonist jumps ahead of her and dies. But his soul can not come up with the fact that he's going to die a virgin, so the soul rushes back to fight for control of the body. As a result, protagonist controls his body only during daytime. At night evil spirit dominates with the aim to hurt the dearest persons to main character.

[From vndbreview]