Tenshi no Saezuri

Tenshi no Saezuri summary:

Sanae Kitajima is a psychiatrist specializing in end-of-life care. Her boyfriend, Takanashi, who once struggled with a deep fear of death, returns from an Amazon expedition profoundly changed. What happened during the expedition? What is the true meaning behind his cryptic words, "I can hear the whispers of angels"?
A complete manga adaptation of Yusuke Kishi's original novel, known for producing numerous masterpiece horror novels such as The Black House and Lesson of the Evil.