This is a portal fantasy romance book with the two main characters coming from worlds connected by a pawnshop in Japan where customers exchange their memories and regrets for money. The new proprietor of the shop in the magical world, Hana, meets a scientist from our world named Keishin on her first day in business and the two embark on an adventure looking for Hana's father owing to their suspicions that he has set a series of events in motion which may soon subject them to a harsh penalty by the monstrous enforcers of this world. The two journey through a dizzying assortment of bizarre settings pursued by the bad guys, fearing death or torture. They discover secrets about Hana's past and about the world itself, and in the process fall in love. There are some harrowing scenes along the way, both with regard to the main duo and in flashback.

I myself am not a fan of the "romantasy" genre and had trouble accepting the scenes between Hana and Keishin, mostly told in dialogue which struck me as hard to believe. Hana was betrothed to another man in her world who both cared for her and was treated badly for helping them, and I didn't like what he suffered. Also, the way the characters' quest was structured seemed too easy. Without an ultimate goal in mind that they would have had to try to break down in steps, they instead just happened to go though a long series of incidents that just happened to advance them steadily along the way, over and over, as though they were on a railroad track the the destination. In the version of the book I read, the ending was a sort of epilogue to the main action that didn't feel completely earned. But other than these structural elements, I would like to give praise to the book for its innovative worldbuilding and the unusual vision of an otherworldly Japan, which I would not mind seeing in other stories by this author. I know this book will have a devoted fandom when it arrives in stores.

I read this book in the form of an advance reader copy through Netgalley in exchange for sharing my review