From JanimeS
Dark Dash, in short DD, is a ESP power which only shows its true face at night or in dark. When activated, certain part of one's skin is turned dark grey. How much and wide it turns into dark grey determines how strong the DD user is.
And it appears there are many people who have this DD power. This caused for DD users to form a group. And of course, there are people who wish to abuse their given power. Among with Sheiha who turns his whole body into dark grey has gathered DDs and built a company which looks like a normal company (STAD ; Sepcial Training A ssociation of Dark Dash) from outside but does killing from inside. Their job is assassination. STAD also owns a very large and famous private school which STAD finds most of their DD users from. The main character here is Tenka, the boy on the above image. Tenka has DD power. And Tenka's whole body turns black, which is stronger than dark grey. But he has been hiding this, since he had no knowledge of Dark Dash. One day, Dr. Suoh approaches Tenky knowing he is a DD but not knowing he is the most powerful DD ever born. Dr. Suoh is Anti-STAD as he is against STAD for murdering people. and there is one more person who is with Dr. Suoh. Her name is Lenong who loves Sheiha and Sheiha also loves her. But Lenong ran from Sheiha as Sheiha once attempted to rape (what?) Lenong.