• Book Name: Ano Toki Tasukete Itadaita Monster Musume Desu Manga
• Alternative(s): あのとき助けていただいたモンスター娘です。 ; Ano Toki Tasukete Itadaita Monster Musume Desu ; 「あのとき助けていただいたモンスター娘です。」異世界おっさん教師 突然のモテ期に困惑する ; "Ano Toki Tasukete Itadaita Monster Musume desu": Isekai Ossan Kyoushi Totsuzen no Moteki ni Konwaku suru ; The Girl Monster I Saved
• Genre(s): Fantasy Romance School Life Seinen Slice Of Life Isekai
• Author(s): Okinosuke
• Status: Ongoing Download Manga
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Summary: 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.