Night Nurse Remastered

In this universe, MC (who deals with his own depression) mysteriously falls ill, which leads to Sayori (who has not been acting like herself) to take care of him as his self-proclaimed nurse. Things aren't as they seem to be, so MC enlists the help of Yuri's cousin, Kotonoha, to investigate things while dealing with being sick and "nurse" Sayori being extra frisky.