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My Once Adorable Master Is Now Incredibly Obsessed With Me!

"I can't do without my Onee-san... it's not fair if she can't do the same, right?"
In order to pay off her debts, Haruka is assigned to take care of a master who lives in a certain mansion.
There, a boy, the heir to one of Japan's leading conglomerates, is living alone for some reason.
She is puzzled by the whims of the boy who claims to be her master, but as she lives with him, she begins to open up to him,
However, as they live together, they grow closer to each other, and and she begins to want to be close to the boy's loneliness.
One day, he asked her, "How about I clear your debt? I'll take you as my wife," and she promises to reply when she grows up.
She thought it was just a childish promise...
Time passes, and the boy grows into a remarkable young man.
He still likes her, but she keeps running away because she thinks she's not good enough for him.
However, when he sees her talking intimately with another man, his obsession and jealousy grow...

The sole successor of an affluent family takes a liking to his new caretaker and promises her a world of intense pleasure whether she likes it or not…

Characters:
1- Haruka Suzuki: Her parents disappeared with huge debts, and she was sold to the Azumi family mansion to pay off the debts. She is self-conscious about her baby face.
2- Yukiya Azumi: During his childhood, he had a severe distrust of people, but his feelings for Haruka became twisted and he grew into a fine yandere.
3- Yukiya Azumi (childhood): He's the heir to a wealthy family, but due to some unforeseen circumstances he lives alone in a large mansion. From good morning to good night, my Onee-san is mine and mine alone.