After finding out the truth behind her birth, sayo is horrified because not.
Webthe moment she did it, the embarrased battler opened his eyes but was slapped by.
Webthe reason for nanjo's death was because she (sayo) couldn't kill jessica otherwise.
Webfrom the portions of the manga i read, sayo didn't actually tell battler she was born.
Webaccording to the book of single truth, which is eva's retelling of what happened on the.