Kanamonoya Yoru Mizaka no Shounen no Ayashii Fukugyou

Yomisaka, a young boy, runs a hardware store selling pots and kettles. He inherited the shop from his predecessor, who passed away last year. He also inherited another business: a "spell shop." Reluctantly, this one is more successful. One day, Yomisaka is taken to the mansion of Baron Kagawa by a man claiming to be his steward, and the Baron orders him to break a curse placed on his son, Chihiro. Yomisaka visits Chihiro, who has taken time off from university and is confined to his annex...

(Source: Shueisha, translated)