NARUTO: Konoha Shinden - Yukemuri Ninpouchou

The novel has three protagonists—Guy, Kakashi, and Mirai—and takes place at a hot spring. The novel "ties together Naruto and Boruto," and is set between the final chapter of the original Naruto manga and the Nanadaime Hokage to Akairo no Hanatsuzuki spin-off manga.

(Source: Anime News Network)

Note: Adapted into the Steam ...