Shikaku Tantei Higurashi Tabito (2015)

They're both mysteries involving characters that have lost a couple of their core senses.

They are connected. same characters and story. the special comes out in 2015 so you understand the story better if you watch it in order. the story does make sense if you don`t

both about abilities to do with the eyes but ones about memories and the other is about senses. they help the police investigate with there ability