[Machine Translation] Senba and Hiiragiwo, who became siblings after their parents' remarriage, are so close to each other that they are considered to be "black brothers". Senba and Hiiragi Ogou, who became brothers after their parents' remarriage, are so close that they are considered to be "blacconi" (brothers in love). However, in the process, Senba is suddenly ordered to do something, and the one who saves her is Hiiragi, who was supposed to be a Normal! After being made to come by her brother, Senba's body starts to react to Hiiragi's little commands.... A heavy love-obsessed younger brother and a natural good-natured older brother in a Dom/Sub universe!