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Ruby and Hoshino are approached by Shiina with a case that involves Echchigawara's long-lost family heirloom, which has the power to reveal deep secrets of the past. As they dig deeper, they unravel a mystery that not only binds their fates but also puts them in grave danger.

A central character from the anime/manga Oshi no Ko . Her popularity has made her a frequent subject for fan art and unofficial animations.

is a central character from the hit series Oshi no Ko . "Shiina" likely refers to from The Angel Next Door Spoils Me Rotten .

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