Watashi no Tonari no Yandere-kun

"My kouhai Kishi-kun appears to be my stalker."
Rika, who works at a production company, is troubled by the presence of her kouhai, Kishi, who seems to hold an abnormal adoration for her.
At the office, he's always looking at her from behind, he notices even the smallest changes, and on top of all that he also turns out to live next door?!
He cares so much about Rika that he can't stop acting in mysterious ways that barely cross the line...! Yandere office love!