• Book Name: Ano Toki Tasukete Itadaita Monster Musume Desu. Manga
• Author(s): okinosuke(Story&Art)
• 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' becomes his student.