Manga written by Mangaka Okinosuke:
https://twitter.com/okinosuke_0
Ano Toki Tasukete Itadaita Monster Musume desu. Isekai Ossan Kyoushi Totsuzen no Moteki ni Konwaku suru
Some 20 years have passed since the protagonist was summoned to another world and retired from the army. He is still single in his 40s and lives as a low-ranking professor, until one day, an elite 'monster girl' transfers into his class.
Chapter 47
5 months ago
Romance
Isekai
Drama
Fantasy
Slice of Life