OBA-143 I want to tie up Mom! Iori Ryoko

Sudden obituary. Ryoko, who lost her beloved husband to illness, has a big hole in her heart, and she spends her days lethargic. Her only son Kenji, who couldn't stand her Ryoko, wanted to cheer up her mother somehow. One day, Kenji finds a scroll among his father's belongings. Kenji greedily reads the scroll that says "Bondage Five Rings". And Kenji knew. The fact that her mother, Ryoko, has an extraordinary interest in bondage.