On the brink of death, the two attempt a desperate magical pact. Through a twist of fate (and the typical ambiguity of ancient magic), Takumi does not become a mere slave but instead becomes the "Master," while Sephys becomes his devoted "Slave." Bound by a magical contract that enforces loyalty and desire, they escape their captors.
: Given the "soldier" aspect, there could be a strong emphasis on action, battles, and possibly strategic elements. Dorei Senshi no Isekai Taneuma Seikatsu
The series (full title: Dorei Senshi no Isekai Taneuma Seikatsu: Mahou mo Bujutsu mo Saikyou da shi Harem made!? ) is a dark fantasy isekai manga and light novel series that combines high-stakes action with adult themes. On the brink of death, the two attempt