The Neverending Winter, the Land of Broken Dreams (Light Novel) by Mei Hachimoku

Trapped inside a terrifying time loop at an eerie, remote amusement park on the outskirts of Tokyo, a high school student named Casio must figure out why his own friend stabbed him to death. He encounters Asebi, a mysterious girl who has been stuck reliving the exact same day for an eternity. Together, they must navigate a dark, psychological nightmare where the only apparent way to break the cycle and escape is to kill someone.