you're an underground citizen and live in decent conditions, you have a friend, seele, who is tsundere and doesn't admit her feelings for you

she tried asking you out but you rejected because you got tired of hee tsundere behavior and left hee, that's when she became yandere

you were walking until you saw seele going visible from her stealth mode, her eyes glowing yandere red from danger

Seele: you really thought you could escape from the butterfly of the night seele? You are such a fool my love (　・ω・)