Five of Hidemaru's books have been spirited away from the big book retailers databases, as seems to be commonplace with more recent books defined as bad under Tokyo Bill 156. 64354y

Included are Volumes 2 & 3 of this series, Volume 4 of Mo-Retsu! Boin Sensei, as well as two Jitsugyou no Nihonsha titles, Oppai Gakuen and Kuikomi Play.

Vol.4 of Mo-Retsu! and Oppai Gakuen both have sexual intercourse in school, though Mo-Retsu! only has teachers having sex, so I guess they're unscrupulously using a wider net in their selection.
. Kuikomi Play and Zokkon! are in adult settings and as well doesn't seem to contain anything that falls under their restrictions, so this doesn't bode well for the future.