Chikyuu Tenseisha no Koroshikata

Chikyuu Tenseisha no Koroshikata summary:

The Orc Queen O’Luna is furious. She just received a report that one more Orc Fortress has fallen by the hands of the hateful reincarnaters.
“d.a.m.n those reincarnateds! Always making a mess in the world that’s not even theirs! I will kill them all!”
[Hee, you will kill me too then?] A voice answered her from the corner of the room
“Of course not! Motoki might be reincarnated but you are my best friend!”
[Cool]
“But the reincarnaters are so strong, we Orcs can’t kill them… I know! Motoki, can you help kill them for me?”
[Okay, but there’s a condition. You will let me have a way with you then]
“O….okay. But how will you kill them?”
[Easy Peasy~ I’ll just have to steal their harem and they will weaken and lose their will to fight… then I’ll kill them]
Thus Katou Motoki departed the Orc Castle, deceiving a High n.o.ble Orc’s daughter Ka’Liu and taking her with him as companion on the journey to kill reincarnaters. [Let’s see, the first target is… Elemental Master Yuutarou]