There's not much known about Eishu High School as they were only briefly mentioned in the Team-Up Missions manga ... up a plan using her IQ Quirk to take down Momo, Shoji, Tsuyu and Jiro.

Ichi the Witch is a brand new story, with interesting characters and plot. Its sales for such a new manga have been impressive, to say the least. Ichi the Witch is a fairly new manga series.