Chained Soldier
When mysterious gates open to the dangerous "Mato" dimension, women gain supernatural abilities by consuming "Peaches," leading to a strictly matriarchal society. High school boy Yuuki Wakura accidentally wanders into this realm and is saved by Kyouka Uzen, the ambitious captain of the 7th Anti-Demon Squad. To fight off attacking monsters, she uses her unique ability to transform him into her superpowered "slave"—but the catch is she must intimately "reward" him after every battle. Written by Takahiro and illustrated by Yohei Takemura. Mature content.
Read Chained Soldier manga in English, updated regularly. Also known as: 魔都精兵のスレイブ · Mato Seihei no Slave · Slave of the Magic Capital's Elite Troops