Sekai Saikou no Ansatsusha, Isekai Kizoku ni Tensei Suru

[KrayZ33]

Could see? He straight up said he did that with Tarte. He's obviously doing it here.

If he was just niceguy harem-building, he would have taken in all the girls. But he only took the one with mana.

Contradicts with his character and wish to not be used as only a tool himself though.
Pretty sure he is just a male tsundere.

There are ways to be benevolent and still get what you want.
And what good would a person without mana be to him. He would just put them in unreasonable danger.

His family works in dirty work for the greater good. In his earlier life, he just did dirty work for his employers, right and wrong didn't matter. Now it does.

Have to watch EP6 yet but I doubt it's going to be any different considering what has happened in the very first episode of this show.