Gea's next reincarnation will take him to the Fourth Holy Grail War in Waver Velvet's body, where a special synergy with him will allow for an unprecedented dynamic with Irisviel and Saber. Meanwhile, the parallels between Kiritsugu and Kirei will take a sudden and much less favorable turn towards the feet of more sadistic girls. What will happen when everything collides? Welcome to the '90s~