Yui Saiki is a person with super powers, and is also the twin sister (brother) and brother-controller of Kusuo Saiki. She is determined to send all those who have evil intentions to Kusuo Saiki to the underworld to beg for food.
For the sake of my brother, it doesn't matter if I fight against gravity, it doesn't matter if I fight against God, it doesn't matter if I fight against God's beloved child, whoever is a coward is a cockroach!