Thanks for the chapter!
Shouldn't it be Marika-san for formal and just Marika for casual after receiving permission from her? Seems like despite having Super Strength Marika doesn't have the experience or resolution to fight and kill even monsters which was why she was in trouble with the white ape. Poor Gashita, not only has trouble killing the monsters but finding them before MC does. Hopefully he'll mature soon and work on improving himself rather than getting angry and/or jealous and focusing on ranks. After all, ranks just shows how well person did completing guild missions, not true strength. Good MC following to help out, but considering his all-rounder specialties shouldn't he bring a shield or another weapon too? Just a sword is going to limit him to Slash techniques when should bring a shield for Guard techniques since the monster is so powerful it needs multiple B and C ranks working together to defeat it.
Btw, speaking of monsters, shouldn't the MC have had experience dealing or encountering them since was part of the Demon army rather than being completely ignorant? After all, if part of the army encountered a monster they would have brought useful parts back to be used and talk about it's attack patterns, strategy to defeat it, etc. That or at least handling the paperwork about it. Although could just be the stuff showing up around the village are different species than the ones he encountered in Demon Lands. On the other hand the village doesn't seem that far from the Demon Capital considering he ran into Marika after walking for just a day or two.