Raising a half-demon child in another world turns him into a yandere
Ongoing | Fukuzawa yuki,Toriumemaru | 2022 released
"If you cheat on me...I'll kill you" excellent choice of a first page thank you dear mangaka for not wasting any time in letting me know that ml is a blatant red flag though the title speaks for itself. Even with only one chapter out, the trajectory of this manga is painfully predictable: a shunned half-demon child, sheltered and cared for by the protagonist, falls in love, but its not platonic its romantic.
Reikan Aru Youkya to Kowai Inkya