Live Dungeon! - Vol. 8 Ch. 47 - Absolute Helix

[MangaDex]

 

[vixia]

Now I wondering, how did he know that if he cleared 100th floor he will came back? Did I miss something?

 

[PuckElf]

Now I wondering, how did he know that if he cleared 100th floor he will came back? Did I miss something?

So far as I know, he's only guessing. I think he figures that since beating the last boss in the game sent him to this world, beating it here would send him back.