Qing Wu Dong Cha

This is a story of a mystery investigator, Levi, and a flamboyant medium, Laird.

Two people have disappeared in this ordinary town. They were seen entering a 'door' that sudden appeared only to disappear along with that 'door'. To find the missing, investigator Levi and self-proclaimed psychic, exorcist, explorer, and mystery researcher Laird decide to enter this 'door' together and investigate the truth behind it all.

Laird, "And here I thought mean and aloof people like you don't understand what a 'warm hug' is!"
Levi, "Why? Is this not warm enough for you? It's not that difficult."

(Source: Bilibili Comics)