It's your standard system story that should NOT be taken too seriously. It definitely aims to be fluffy and cute with its highly intense action scenes. I always find myself wanting to read a slice of life version of the story as I just love the characters and their interactions with each other. I do hope we get an epilogue of the MC living their life out as I could read on forever about them.

Well you have 2 MCs, but there are 7 supporting MC which all have a major role and have the same screen time as the protagonist. Yes there is F/M, but the yuri is by no means drowned out by it and I think there are more Yuri chapters than there is F/M at the moment, plus like you said you're not interested in it and by that you mean the r18 they are skippable as they are just bonus content.

A great story that scratches the apocalyptic itch with a great side of romance. The MC is F/M, but there is also a strong presence of yuri with there being 2 yuri couples and 2 f/m couples. I didn't think having most of the characters we follow in a relationship would be so good, I mean after thinking about it, it made sense. They only have each other so may as well enjoy it. It definitely doesn't feel like we are following one person's story, but it's the entire cast's story. We get the great highs of battle and then we get the slow interludes which also serve as ways for them to discover themselves as well as further their relationships. It feels like I am there with the squad experiencing the terrors of the world and laughing with them whenever they have a moment of rest. Overall give it a read, It has a bit of everything, so if you enjoy Yuri there is plenty of it and if you like F/M there is also something there for you. Love action there is plenty of arc of intense battles as well as mysteries being uncovered.