Original author Yasuhisa Hara attended the opening day of the stage play Kingdom II: Keishō, according to its production announcement.
After the performance, Hara visited the dressing rooms of the full cast to offer encouragement. A passionate letter followed the next day.
Actor Yuichiro Yamaguchi also spoke at the press conference, saying that talking with the original author so much after an opening day was a first. The announcement describes the production as a must-see for fans of both the stage show and the Kingdom series.
AniHeat's take: Worth noting for fans of both the Kingdom series and stage productions, since the original author's involvement on opening day is highlighted in the release.
Announced 8/11. Source: Official X (@toho_stage)