Dasei 67 PercentDasei 67 Percent.

Dasei 67 Percent (Japanese: 惰性67パーセント, Hepburn: Dasei 67 Pāsento; "Inertia 67%") is a Japanese manga series written and illustrated by Shimimaru. It was serialized in Shueisha's seinen manga magazine Ultra Jump from July 2014 to June 2022, with its chapters collected in nine tankōbon volumes.