The supporting character's harem is very normal - Chapter 154 Master is dead!

Fate, a gatekeeper who had been working for the castle, is beset by a few burdens.

Warning contains-Incest/Ntr/ Heavy NetorareA Boy struggles with the problems of being raised in a family full of lewd older women.

I exist in the darkness, disappear under the bright light, and will eventually devour the sun and turn into the shadow of all things… Known by people as the indescribable terror of darkness; the king of shadows; the dark day; the existence of the shadow of the world , is still just a somewhat special high school student, facing a weird death game…

- Description from novelbuddy

Mana Awakening. Systems. Gates. Reincarnation.Any one of them would be enough to build a story around. But Ellis’s story has them all… and more.It began with the sudden changes to his world, and how Ellis believed he was adaptive enough. That maybe, finally, he could achieve something.But with coincidences and circumstances stacked against him, in the end… he was reincarnated into a different world.What awaits him there? Will he be able to return to Earth?And more importantly, will he let the circumstances dictate the course of his life again?