Kitsui (きつい, Intense) is the son of Eri Kurosaki, born from the research and experimentation of Bansui Amatsuki. He is a perfect Tsuji modelled on Kenji Hiroshi using the latter's DNA, which essentially makes Kenji his father. Following the Collapse, which saw Kenji intervene to protect the Serenity Jewel of the Yume Clan from The Outsider, Kitsui followed Kusaka Kori and dropped off the grid, becoming the latter's apprentice.