After leaving a toxic job, Shiro Amata moves into his inherited house, only to uncover two astonishing truths: his grandmother was a witch from another realm, and a gateway to this realm lies behind her closet. Guided by her book, Shiro gains the incredible power of 'Equivalent Exchange,' enabling him to exchange currency between worlds. Eager to amass wealth, he opens a shop selling everyday items to the fantastical beings of the other world. With dreams of financial independence, Shiro aims to never work again, sparking a whimsical adventure. Adapted from the light novel.