5.0
challenging dark emotional mysterious sad tense fast-paced
Plot or Character Driven: A mix
Strong character development: Yes
Loveable characters: Yes
Flaws of characters a main focus: Yes

This is definitely my favorite light novel. Chuuyas backstory is literally devastating, and the flags make me so sad. Many tears were shed lol. Verlaine also made me really sad in the end. 
“You sound like you're certain he's human."
"I am." Dazai sighed, smiling. “There's no way I could hate a man-made character string this much.”