From Fateful Encounters:

Based on novel by Kaminaga Manabu. Shinrei Tantei Yakumo, aka psychic detective yakumo, tells a story about a college student, Saitou Yakumo who is born with different eye colors. His red left eye gives him a special ability to see ghosts and spirits. He believes ghosts and spirits are bound to earth because of a certain 'cause,' and simply eliminating that 'cause' will let those spirits rest in peace. Being asked for help by Ozawa Haruka, they begin the investigation together.

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Includes an unrelated side story called Pen x Pal in vol.1.

Niizuma Tomoki has been re-assigned to the Special Investigations Counter-Measures Unit after her one month suspension. This basement unit only has two others assigned?! The future of police is entrusted in the hands of the pretty-faced young mathematician called Mikoshiba Gakuto. Objectively weighing the truth of cases from a mathematical approach. Clearly and splendidly exposing the depths of the human heart with numbers!

From Hyper Parfait:

Kuchiki, a flutist, was plagued by nightmares every night that forced her to seek the help of counselor Matsuzaki. Ishikura, a police inspector, unexpectedly discovered a headless mummified body in an empty apartment and is now on the case. When Kuchiki regains her lost memories, the curtains also opens to a tragedy!

Fateful Encounters:

Saitou Yakumo, a college student, was born with different eye colors. His red left eye gave him a special ability to see ghosts and spirits. He believes ghosts and spirits are bound to earth because of a certain 'cause' and simply by eliminating that 'cause' will help those spirits rest in peace. Being asked for help by Ozawa Haruka, together they begin their investigation.

The National Police Agency Security Bureau has a secret organization known as the Next Generation Crime Information Centre. Their job is to stop murders before they actually happen, by using a certain girl's precognitive dreams.