13TH FOOTPRINT HC (2025)

After yet another unsettling postcard arrives at the Togawa house, the search for answers begins, and it all leads back to Touya! He recalls having a similar postcard in his youth, but how long ago was that? That's when Touya remembers that he gave it to someone- a boy he knew named Sora. But that was ages ago! Could Sora, someone from the furthest reaches of Touya's past, really be the mysterious sender...?

Following their son Ao's release from the hospital, Touya, Haru, and Ao were all ready to start a new life in their picturesque new home. But that was before the postcards arrived... Each postcard details an event-one that won't happen until the next day. Follow this family on an adventure to unravel the mystery, stopping to help everyone they can along the way.