Supadari Ouji-sama no Kurui Ai

The love of a prince who seems too perfect is both sweet… and dangerously obsessive. Admired by everyone as the ideal man, the prince appears flawless on the surface: handsome, capable, gentle, and endlessly devoted. But hidden beneath that perfect exterior lies a dangerous madness that nobody else knows about. The heroine gradually becomes the center of his overwhelming affection — an intense love that borders on obsession. What begins as a dream romance slowly reveals darker emotions: possessiveness, jealousy, dependence, and a desire to keep her by his side no matter what

https://www.cmoa.jp/title/353731/