In the same month, however, it was revealed that Koma had adultery with Umako's daughter, Kawakami no irazume (one of Emperor Sushun's wife in a lower rank), and Koma was executed by Umako.
しかしその月に、馬子の娘である河上娘（かわかみのいらつめ、崇峻天皇の嬪）との密通が露見し、馬子によって処刑された。