The Kai festival at Akama Shrine, held between 2nd and 4th May, is a cultural and religious event that commemorates the life and death of Emperor Antoku, who passed away at a young age during the naval Battle of Dan-no-ura in the Genpei War. This battle, which occurred in 1185, was a pivotal moment in Japanese history and marked the end of the Taira clan’s power. The Akama Shrine, where the festival is held, is dedicated to Emperor Antoku, who is enshrined there. It serves as a poignant reminder of the young emperor's tragic fate and the historical impact of the Genpei War. The shrine also has the graves of Taira leaders killed at the Battle of Dan-no-ura.

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The festival includes traditional Shinto rituals and various cultural performances that reflect the rich heritage of the region. These performances include classical Japanese music, dance, and historical reenactments related to the battle and the emperor's life.

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On May 3rd, the "Joro Dochu" takes place, during which Tayū (the highest class of traditional courtesan) can be seen in their stunning attire, walking in their tall wooden clogs known as geta, around Akama-jingu Shrine and the Shimonoseki City Center.