Yo-kai Sangokushi[a] is a turn-based tactical role-playing game developed by Koei Tecmo and published by Level-5 for the Nintendo 3DS in 2016 exclusively in Japan.

[1] While exploring the library of the Springdale Elementary School, Jibanyan, Komasan, and Usapyon find a book titled Yo-kai Sangokushi, which they are teleported into.

Yo-kai Sangokushi sees the player battling enemies in multiple different areas in a turn-based format.

Each Yo-kai also has a unique "Soultimate", a more powerful move that, depending on the user, can either be offensive or give positive effects to teammates.

[3] Prior to when the development of Yo-kai Sangokushi began, Akihiro Hino, the CEO of Level-5, and Yoichi Erikawa, the founder of Koei Tecmo, had a "close relationship as game creators" and had talked about working together at some point.

At an unknown time, Erikawa had sent a letter to Hino praising the Yo-kai Watch series and its ability to expand into multimedia.

"[3] Yo-kai Sangokushi was first announced by Level-5 on April 7, 2015, through a presentation held at the Tokyo Dome City Hall.

[6] On January 14, 2016, CoroCoro Comics, the serializers of the Yo-kai Watch manga, published an announcement for the game on YouTube.

[8] For a limited time in 2016, Lawson HMV Entertainment released an official pencil board featuring the main characters from Yo-kai Sangokushi.

[16] Shinichi Yamoto, also writing for 4Gamer.net, described the game's ending theme as "combin[ing] the energy of Yo-kai Watch with the history of the [Romance of the Three Kingdoms series.

[17] Yo-kai Sangokushi, as well as other games, helped increase play activity from younger Nintendo 3DS players.