The Godless World of Onee-Chan

This spin-off of the hit anime Working for God in a Godless World delivers a terrific twist in Isekai style. Can a sister with God-tier strength find her younger brother in a world without religion?
The acclaimed anime that is Working for God in a Godless World, on Crunchyroll, begins when Yukito goes missing after the cult they grew up in enacts some strange ritual. Little do they know; it is that same ritual and their same God that sends him to another world.

But who thought that the older sister he left behind would follow him into this new world? This spin-off of the anime marks the beginning of her adventure that intertwines with her brother's battle. Chiyomaru Urabe has cheat-level super strength, taken from the powers of the God Mitama. She hopes that these powers will be enough to find her missing brother in a world without religion. As she explores the intriguing, yet faithless, land created by Shinya Murata, will super strength be enough to uncover the heavy truth and reach her long-lost brother?

(Source: Titan Manga)