とらぶる☆魔女試験～会長様と天然っ娘は魔女姉妹！中出しエッチで魔力補給をお手伝い！～

Minato is a university student. One day, when he goes to the school, he sees Eriko and Sayako fighting against a monster using magic. While they pay attention to him, they are attacked and get cursed by the monster. He is forced to take the blame and told to sleep with them to relieve the curse....