VSPO! Destiny Reversed: Seven Days to Save the Fallen

Kanata, a high school student, suddenly wakes up one year in the past. The trigger is a strap given to him by Sakura, his best friend who died in the future. This strap lets him keep his memories and redo the past. Kanata runs desperately to stop the tragedy of all VSPO! members being murdered. The tragedy he remembers is a serial murder case targeting the group. The killer is unknown. Kanata cannot convince his friends, so he fights alone. But Sakura's smile from his memories keeps him going.