Himitsu no Psycho-san
秘密のサイコさん
My library
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-Description
he most terrifying guy and the most popular girl on campus are two people nobody could ever expect to see together. Why are they bonding over a little teddy bear, of all things? It's such a strange sight, but nothing is as strange or horrifying as the secret that ties their fates together! (source: Manga Planet)