Загадочные истории антикварного магазинчика Мононобэ

Sōtarō Mononobe, a silent individual, operates a used bookshop called Mononobe Koshoten. While Sōtarō is reading, his assistant, a boy named Shiro, manages the shop. However, the bookshop is merely a cover for Sōtarō's main work, which involves collecting certain unpleasant old books for his personal collection.