"Senior Brother, love may last a long time, but when love fades, hate lasts even longer."
The senior brother I loved fed me a potion that made me hate him. I stopped chasing after him, but then he regretted it and began pursuing me desperately.
Note: First-person narration.
The two of them have an additional story in My Junior Sister Is So Radiant.
Theme: If you love someone, love them well.