Reborn: I'll Never Fail My Childhood Sweetheart Again - Chapter 62 - 43: Promise Me, Don’t Be a Jerk!

After spending his sixth year at Hogwarts a century ago, Harry finds himself back in the cupboard under the stairs in 1991, once again receiving his Hogwarts acceptance letter.“You’re telling me my parents were killed by a dark wizard?” Harry asked. “Who is this dark wizard? Why are you all so afraid of him that you won’t even say his name?”“It’s Vol—,” Hagrid began cautiously. “Well, we call him Voldemort, because he personally killed hundreds of people.”Harry nodded nonchalantly.“And what happened the next day?”Hagrid: “Uh?”--

I died the way I lived—cheap, broke, and naked.One freak laptop accident later, I wake up in my younger body… back when I still had hair, hope, and zero rent money.But this time, I’ve got something else.A system.One that talks. One that levels me up.One that feeds off... intimacy with women carrying “Yin-rich energy.”And the first target?My mysterious landlady. She’s mature, curvy, and definitely hiding more than just a killer figure under that robe.To grow stronger, I’ll have to seduce, satisfy, and survive the “Dual Cultivation Trials” the System keeps throwing at me—each more insane than the last.It’s time to become the strongest lewd cultivator in the modern world.And I’ll start... by paying my rent.Tags: romance | reincarnation | system | r18 | comedy | harem | cultivation | slice of life | fast paced | urban | academy | milfs | older women

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

- Description from Novelupdates

A polite and lethargic boy was reincarnated in another world as a vampire bishoujo.