Based on the adult manga by Shouji Ayumu.

Measurement of height in elementary school has finally arrived. This is the opportunity for the pedophile lascivious teacher to enjoy it. Kouda grade 3-B can not attend classes and body measurements. Therefore, Kouda performs follow-up measurements with the teacher. This golden opportunity is very good for the teacher pervert and pedophile use it to do pervert with elementary school children.

(Source: Nekopoi and Has Been Translated and Edited)