My Sister's Cool and Aloof Best Friend Is Actually a Yandere!

[One Female Lead] [Pure Romance] [No System] [Slightly Yandere] [Older Woman-Younger Man Romance]

You are my medicine.

I'm seven years older than him, and I'm his sister's best friend.

The first time we met, he was wearing a white shirt and feeding stray cats on campus.

I thought he was a little brother who needed looking after, until the day he cornered me against a wall.

"Sis, why do you always treat me like a child?"

I looked down and saw the faint outline of his abs beneath his shirt. For the first time, I panicked.