One night before bed, Shiro pulled little Rin aside. He pulled out a blue leather journal that read "DIARY" on the cover and showed it to the 7-year-old. The boy looked at it curiously. Shiro explained to Rin that it was a special journal to hide your secrets and hold memories. He told Rin to keep it hidden from others and never show it to anyone. Not even his younger brother, Yukio.

After everyone went to bed, Rin wrote an introduction to his new diary.

Dear Diary, Introduction (Rin)

I got this diary thing from dad. I guess I'll start off by introducing myself. My name's Rin. I have navy hair and blue eyes. I get into a lot of fights. I love to cook. I'm kind of dumb, I don't do well in school. I have a twin brother, he's the opposite of me. He has brown hair, aqua eyes, and glasses. He's really smart. I always make sure nobody hurts his feelings or anything.

Little did Rin know, Shiro also gave Yukio a diary. It was brown leather with the same text on the cover.

That night, the younger also wrote an introduction.

Dear Diary, Introduction (Yukio)

My name is Yukio Okumura. I will hold my secrets and memories here safely. I have to hide this diary though, so my brother, Rin, doesn't find it. Dad gave me this diary. I hope to write soon...