Mato Seihei no Slave S01

When entrances to a new dimension known as "Mato" emerged all over Japan, a new source of power known as "Halo" was discovered that gives unique abilities only to women. However, dangerous creatures known as "Yomotsu Shuuki" also reside in Mato and have been responsible for disasters ever since. To counter them, the government formed an elite group of women who have received Halo powers, known as the "Anti-Demon Corps". One day, high school student Yuki Wakura was on his way home from school when he suddenly got lost in a Mato entrance. As he calls out for help, Kyoka Uzen, the leader of the seventh unit of the Anti-Demon Corps, saves him. She sees Yuki's ability and also needs him for more Halo power, so she asks Yuki to join the group on the condition of his servitude, which may be more pleasant from the start.