Shounin Skill de Maou-jou no Kouryaku wo Mezasu: Isekai Teni Shita node Saikyou Item to Talk Jutsu de Ikinuku Koto ni Shita

Also known as: 商人スキルで魔王城の攻略を目指す ～異世界転移したので最強アイテムとトーク術で生き抜くことにした～, Aim to conquer the Demon King's Castle with merchant skills, Aiming to Conquer the Demon King’s Castle with Merchant Skills ～Since I Have Been Transported to Another World, I Decided to Survive with the Strongest Items and Talk Techniques ～

by Atsushi Suga

One day, Sota, a university student, is summoned to another world! Moreover, after being summoned, he was mistaken for a hero and imprisoned in the Demon King's Castle, where he was in a desperate situation...! Sota gets through the predicament with his natural skill, but for some reason he ends up solving the embarrassing problem of Fafnir, a super beautiful demi-human...!? Win the hearts of the demi-human girls living in Demon King's Castle and aim to escape from Demon King's Castle! A fantasy romantic comedy that opens up a different world with its natural business spirit, begins!