The Poor Boy You Bullied Is Locked in the Supply Room with You

Any Books With an Extremely Yandere Character? The Kind That Gets You Excited in the Middle of the Night

Looking for books like After Failing to Escape from the Yandere Male Lead. Something along those lines, but even crazier? I want a story that's almost entirely about the yandere. Not too many other characters.

I Want Yandere Leads! Not Ones Who Bullied Their Disciples in the Past, and Not the Regretful-Type Yanderes