Ao to Boku (2018)

Male leads in both productions have to cope with death of their best friend. Both Ao to Boku and Pink and Gray are aesthetically pleasing and feature some kind of plot twist

In both dramas, the characters questioned themselves abt the death of their friend. Is there someone to blame? Who's really in fault? They only move on with their lives after answering these questions.

Male lead tries to deal with his artistic best friend's death. Both productions have similar vibe, and the plot is introduced through the dead friend's drawings