Character profile
Ouji Kousaka
高坂王子Biography
Ouji Kousaka is one of Yukiteru's classmates and is known for recording his proudest achievements in a blog he calls the “Kousaka King Diary.” His posts often end with the boastful phrase “I'm Shining!”
Story spoilers
Because his phone blog is connected to the Eighth's diary, Ouji becomes a Diary Holder Apprentice. The resulting diary records his successes but not his failures, a limitation that leaves him vulnerable, and Yukiteru later destroys it without killing him because it is not a true Future Diary.
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