If you're looking for anime similar to World’s Greatest Militia (Novel), you might like these titles.
There is a series of Buddha statue thefts in Kyoto. Beniko, a high school girl, gets the Buddha statue at her family's temple stolen and has her parents killed at the same time. Beniko hears from Enju, her parents' friend, that a robbery group called SEADDATTHA is the one who killed her parents, and feels the strong urge for vengeance. Enju offers Beniko to live with him since she has no place to go. She wanders into Enju's secret room and meets an ugly creature that looks like a fusion of her parents and Buddha statue...
Ryuta and his friends from the science club visit a museum exhibit on Thomas Edison and it's there they learn about one of his proposed inventions called the "spirit phone" which would enable communication with the deceased. Later that day they bump into a shaman who claims she has a message from Edison. In an instant Ryuta is given the necessary knowledge he needs to construct the device and decides to go for it, so begining a spiritual adventure.
Kou Outori a normal high school student who experiences a repeating dream of being eaten by a beast from inside himself. When Kō meets Reiichi Kuki, the elite student who rules his school, the encounter awakens hidden powers inside him.