EXM? My Pet's a VAMPIRE QUEEN! / INCUBUS MASTER: DIVINE HAREM

A traveler fails his awakening but binds a god system. He contracts a vampire queen, breaks class rules, and enters a top academy. He slaps rivals, captures divine beasts, and crushes every test. Now he heads into a deadly demon lair with his goddess beasts. But can a boy with no power really become the ultimate demon lord?