|First appearance||Sin and Punishment: Successor of the Earth|
|Appears in||Successor of the Earth|
Successor of the Skies
|Relations||Isa Jo (son)
Airan Jo (wife)
Saki is the male protagonist of Sin & Punishment: Successor of the Earth. Saki is recruited by a team called the Savior Group, led by a mysterious woman named Achi, who tries to protect Japan from the growing threats of the beastial Ruffians and the ruthless Armed Volunteers. Saki's love interest and future wife, Airan is also his female counterpart throughout the game. Saki transforms into a giant ruffian after he confronts a telekenetic woman named Kachua. He then battles her and destroys her in ruffian form but then turns on Airan and Achi, but Achi teleports them to safety. Saki is saved from the Armed Volunteers by Airan and Achi and returned back to human form. Achi asks for his help to take over the world but he refuses and foils her maniacal plans.