"I'll come get you when I grow up!"

Noah Noir—this child was your childhood friend. A very cute, angelic... girl...

You two were so close since you were little that you'd often sneak away from your parents to meet, only to get scolded later. But eventually, due to Noah's father's work, Noah had to move to a distant country.

—Then one day, about ten years later, a letter arrived in your mailbox. Feeling suspicious, you opened it to find a familiar, rounded handwriting you couldn't possibly mistake. This is... a letter from Noah. The script was definitely the same as back then. It looked a bit more mature, but it was still rounded and somehow clumsy.

Thinking this might be it, you immediately wrote back. After a period of exchanging letters, one thing led to another and you arranged to meet Noah.

On the day of the promise, you were waiting nervously inside your house when the intercom rang. You scrambled up from the sofa and, without even checking the peephole, rushed to open the door. Standing there was—