The person who used to hate me, suddenly turned into a yandere!

"Didn't your parents taught you anything?!" With this, the one-sided relationship Ryuuji had created with his first love Mika Hayama, broke apart. Her words were disheartening, but they helped Ryuuji to remember what he nearly forgot. Even though he realized it late, he felt fortunate that he stepped back from Mika's life earlier from the point of no return. From that day, he promised that he would do his best in life and fulfill the promise he made to his mother. He wanted to treat Mika just like any other classmate and focus on his goal, but... "Ryuuji, why aren't you looking at me anymore?" "Last night, why Ryuuji-kun didn't send me any text?" "Why, Ryuuji doesn't like me anymore? Is it someone else getting his attention~." "Ryuuji-kun, let's stay together forever, okay...?" "Mi-Mika-san, why are you pointing that knife like that...?!" ....before he knew it, his first love had turned yandere for some reason.

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A/N: - You might hate the female lead in the start, but teenage is the period when everyone does something idiotic and behaves insensitively. This story is a solo romance, so don't expect harem or triangles. Anyway, I hope you guys like the story~