Hannin-kun, Nani Shiten no? - Tantei Hoozuki Aro no Jikenbo

Mayuki Akaiwa, a mystery novel nerd, and Aro Onikan, a gal who is pushing her comic skills to the limit. The two part-time friends happen to get caught up in a murder case...? The gal detectives solve the mystery with their shining nails and flashing deductions!