I've been searching for this manga but I forgot the title. Hope someone can help!

Hello! Sorry if I don't have that much information, and I hope you can help me. I'm looking for a manga that I read a few months ago. Details are:

• The world setting is post-apocalyptic and modern with magic.
• MC is some kind of a returner who used to be friends with the world "bosses" of the current timeline. For some reason, he'll have to face his friends/bosses who reside in each part of the said world.
• I kinda remember that each boss has different attributes like one who specializes in magic, being a strong beast, etc.
• I think MC had 1 male and 1 female officer friend in the beginning and they don't remember him.
• I believe the MC has a female partner who resembles an elf. I'm not sure.
• The first "boss" looks like a female warlock.
• There was a female character who serves under a douche male officer. She wears glasses and uses a whip as her weapon. She hides her skill and nobody knows she's a combatant.
• I remember that in one of the later chapters, they went into an abnormal forest to survey that had huge trees and beasts.

Thank you!