https://www.anime-planet.com/anime/our-rainy-protocol
It looks like instead of doing the sensible thing like most of the game based anime do and animate the characters properly they managed to do some poorly put together FPS project that looks like it was taken right out of a playstation 1 title. It's ridiculous because the anime itself looks like it has well done characters and everything but they're all acting like this guys some l33t gamer and it's just them running around hip firing at character models on the screen LOL. It's polygon journalist levels of gaming.
There's a lot of good shit dropping and it feels like I'm having an anime buffet this winter but just be warned there's some really bad stuff too. If anyone wants to watch a game based anime that isn't an RPG there are way better options.
The manga is a decent read. MC behaves fairly reasonable given the culture he's raised in, and establishing that culture helps a great deal in excusing a beta MC. It's not a divine morality law about slavery though, it's that one FeMC's specific super magic ability: Many super magic abilities in universe have drawbacks, and her's is that while she can effectively mind-control and super-power any entity (make it a temporary "slave"), she must compensate it.
Other slaves, such as any men who may attract hostile attentions of the super magic warrior women, are both metaphorically and sometimes literally fucked, their compensation is the woman not going preying mantis on them and killing them after they're done, and that compensation isn't guaranteed. MC really lucked out that FeMC finds him useful enough to not kill after her compulsed compensation is paid.
I enjoy the manga considerably, that's why I know its coming out. It manages to draw a great line between "ecchi funny moments" and "legit good battles" and has the two interact in an interesting way.
It will just draw a lot of controversy because of the use of the word "slave" regardless of how it works in universe (I suspect highly it'll be replaced for something else), and the extremity of how many girls are forced against their will to sexually service him over the course of the story because of said power. There is just enough "I don't want to do this!" whine from girls that it'll make people scream rape about it, even if most of them secretly enjoy it.