Tokumi Nazoo, a genius girl with excellent deduction skills, solved murder cases for her famous detective father. She was the one who solved his murder cases four times a week when she was in elementary school. She followed the will of her father who was killed by seven villainous criminals, and she blames herself for his death. However, in high school, she couldn't stand the murder that happened in front of her and decides to get back into the mystery-solving business. (Source: Shueisha, translated)

Shunsuke Suzuki, who works at an advertising agency, spends his days being abused by his strict trainer Kojima. While thinking about quitting the company and wishing Kojima had died, Suzuki happens to see a commercial that Kojima made. The commercial shows a project that Suzuki had thought up and Kojima had rejected. Kojima had taken Suzuki's other projects as his own. When Suzuki confronts him about it, Kojima doesn't apologize, he just gets angry. Seeing Kojima come to work as if nothing had happened, Suzuki finally feels murderous. Then, as Suzuki searches the internet for ways to commit the perfect crime, a mysterious person named Yamino appears, telling him that he should get revenge in his own way... (Source: Natalie, translated)