【Serialization has started!】 It's been three years since I was expelled from my home. When I realized it, I had become the strongest vampire and I'm dominating. Also, when I realized it, I had created a yuri harem.

"Lilith! As of today, I hereby expel you from the Renoir Duchy!" "I'm breaking our engagement!" Lilith suddenly underwent a "primordial reversion" and became a vampire. She was fifteen years old at the time. As a result of this, Lilith suffered the double blow of expulsion and broken engagement, and found herself hunted by the nation. So where did she flee to? The most treacherous dungeon humanity had never conquered. It was a brutally harsh dungeon that even the S-rank adventurer party known as "humanity's apex" could only clear one-third of. Fast forward three years. Lilith, who desperately defeated monsters and pushed deeper into the lower levels, found that——. "Wait...? I managed to clear the most treacherous dungeon...?" Before she knew it, she had become the strongest vampire. Back on the surface, Lilith crushes everything with overwhelming power. She casually annihilates large-scale bandit groups plaguing the nation, repels dragon armies attacking cities, and even battles the Demon King himself. "I want to be sandwiched between big sister's breasts!" "I'll follow you for life, big sis!" And before she knew it, somehow she had formed a yuri harem. This is a story of the strongest vampire, who has become the embodiment of cheat power, repelling all hardships with her extraordinary strength and grasping happiness with her own hands. This work is a short story submission of the first episode of a new series. The girls' love is just insurance.