The Insider System - Chapter 36: Alchemy

Chen Mo a game designer got sent to a parallel world with advance technology but undeveloped game concepts.

“My dad just married the Queen of Hell… and now she’s cooking me breakfast in a bathrobe.”Kazuki Sakamoto was your average awkward university student—until his father remarried a stunning woman from a mysterious dating site. Now, he’s living with Lilith: a dangerously seductive, battle-hardened demon queen trying (and failing) to blend into modern Japanese suburbia.She torches toasters for fun. Summons eyeball familiars to spy on him at school. Wears his dad’s shirts like she owns the place (because she kinda does). And worst of all? She’s disturbingly good at playing the “loving stepmom” role… with a wink that says she knows exactly what she’s doing.Caught between sanity, seduction, and spontaneous hellfire, Kazuki must survive:• A stepmother who flirts like a villainess with a mission• A house full of demonic chaos• And the terrifying possibility that he’s starting to like it⸻A romantic comedy harem full of magic, mischief, misunderstandings—and one very dangerous MILF.If you like seductive demon queens, chaotic slice-of-life, and nonstop supernatural comedy, this is your next obsession.

This is a story of a modern man returning to ancient times, returning to a real world without any extraordinaryness, and slowly rising by relying on the ability to attribute all data.

- Description from novelbuddy

(Non-system, multiple female MCs, both good and evil)Fang Ling, who possesses the Chaos Sacred Body, was fiercely fought over by various forces since his birth. His heart, right eye, and treasured bone were successively taken away...After many twists and turns, the critically ill Fang Ling was placed in front of an ancient temple by a kind-hearted person. No one knew that within this ancient temple, five unparalleled masters were in seclusion. They had been hiding there for tens of thousands of years, suppressing the Immortal Heart of the Demon Ancestor.When the Immortal Heart erupted, the five masters were unable to contain it and took a desperate risk by implanting it into the infant's body. The fusion of the incomplete Sacred Body and the Immortal Heart led to the birth of a peerless monster...