Re:Kinder

Third-grader Shunsuke goes to stay over at his grandmother's house. Upon his return home, he finds not his familiar hometown, but a ruined town of death. He meets his surviving friends and some other children their age, but a crueler reality awaits them...

Re:Kinder is a freeware horror game by Parun (Horafuki Yokochou) made in RPG Maker VX. It's a remake of Kinder, originally released in 2003 with RPG Maker 2003.