If you're looking for manga similar to Kurayami ni Yagi wo Sagashite (Light Novel), you might like these titles.
Hamure Hiyori. From the moment she confessed her love to me, I thought we were going to spend our days as a normal couple. Until I learned of her special ability... This is a sweet and sad love story between a boy and a girl who has the power that will drag the whole world with it.
A great detective who appears out of nowhere and solves cases with brilliant deductions. Kirinomiya Saika, who acts like this, is my senior. She’s the daughter of a conglomerate, not someone that an ordinary student like me can approach, but for some reason I’m being made her assistant. As I’m dragged along to crime scenes, a real murder case finally occurs. “The mystery that wanders in the depths of darkness, I will expose it to the light of day.” No matter how much my senpai shows off her deductions, she cannot solve the mystery.