@givemersspls It was said right in this chapter, the reason that L'Arc and co. disappeared in the corridor was because they were never there. The first set of L'Arc's party, like the second one WERE spirit tortoise familiars that mimicked them as they were known as enemies out to kill Naofumi...
You know, I like the characters in this, which is why I keep reading, but honestly, I miss the days when you could have a titillating trap Manga without all the gender politics bullshit. There is more than enough of that in real life as it is.