After Pressing the 500-Million-Year Button, the Dimension’s Strongest Became Obsessed With Me

I pressed the 500-million-year button, certain that nothing would actually happen. Then a message appeared: I could summon those bound to me by soul contract—a saintess of Bazelheim, an elf, a dazzling mage who wants to claim my first time, and even the Demon King waiting for me on the 100th floor. Just like that, I gained an EX-rank summoning skill.