Ao to Boku(2018)

Ao to Boku is a supernatural drama series following two childhood friends who lost their third companion in 2013. Five years later, one of them receives a haunting email from the deceased friend, accusing him of forgetting. Strange events begin to plague his life, forcing him to confront the past he'd tried to leave behind. Desperate to end the disturbances, he teams up with Shiori, a former classmate, to uncover the truth surrounding his friend's death. As they dig deeper, the mystery becomes increasingly unsettling, blending grief, guilt, and the supernatural into a tense exploration of how the dead refuse to be forgotten.