Asobiba.

Asobiba is an official spin-off of the manga Decus and Alice, presented as a self-contained one-shot that invites readers back into the world of the original series. Rather than extending the main storyline, this companion piece offers a fresh vantage point on the setting and its characters, giving established fans another opportunity to linger in a universe they love while granting the series' creative team a new canvas on which to work. Fittingly for a title that translates to "playground," the one-shot embraces a spirit of playfulness, distilling the essence of Decus and Alice into a single, compact story. It functions both as a treasured bonus for devoted readers and as a welcoming entry point for newcomers intrigued by the series. Carrying the weight of official endorsement, Asobiba stands as a sanctioned expansion of the Decus and Alice universe — a modest but genuine addition that captures the tone and spirit of the original while carving out a charming space entirely its own.