Slave of the Magic Capital’s Elite Troops is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

The demon-filled dimension known as “Mato” has opened to threaten humanity, and a type of “peach” tree that grows there yields fruit that confers special powers to those who eat it, giving humanity a fighting chance, but this only works for women. As such, as protectors of humanity, women rise in social status while men are relegated to second-class citizens scraping for basic occupation and acknowledgment. Cue Yuuki Wakura, a domestically crafty and laborious high school senior whose older sister was taken during a Mato event 5 years before; while lamenting the hardships of the life ahead of him, an event opens before him, and while being rescued from demons by Captain Kyouka of the Anti-Demon Corps, she confers him powers as her “slave” and turns him into a mighty beast mount that mows down the demons. However, there is a surprising price to pay for being her “slave”… and it’s not him who has to pay it.