Konyaku Haki sareta Reijou wo Hirotta Ore ga, Ikenai Koto wo Oshiekomu: Oishii Mono wo Tabesasete Oshare wo Sasete, Sekaiichi Shiawase na Shoujo ni Produce!

Betrayed by her betrothed and bullied by her family, a young noblewoman named Charlotte Evans flees her home and stumbles into the hands of Allen Crawford, a misanthropic wizard known as the Dark Lord who lives in a solitary mansion deep in the forest. When he hears the sad story of Charlotte's pitiful life, he discovers a new calling—giving her a crash course in all things naughty, from late-night feasts of cake and ramen to sleeping in till the afternoon, from dressing up in cute outfits to fun-filled days at the beach! Allen is determined to pamper Charlotte with every irresistible pleasure imaginable. Will he succeed in healing her emotional trauma and building up her confidence? And is there anything special between this odd couple? Here begins the tale of a wicked sorcerer who leads an innocent girl astray...down the path of pure self-indulgence!

(Source: J-Novel Club)