Not in Textbooks Series

Based on a comic by Kazuto Okada.

1. Not in Textbooks (2016)
2. Not in Textbooks 2 (2016)
3. Not in Textbooks 3 (2017)
4. Not in Textbooks 4 (2017)
5. Not in Textbooks 5 (2019)
6. Not in Textbooks 6 (2019)