Letters to Reimu

In a distant future, where Utsuho Reiuji defeated the Hakurei miko /Reimu/ in a battle in the Underground, that defeat meeting Reimu's demise. The outcome of that being the destruction of Gensokyo, and with that instance Yukari Yakumo opened a portal towards our world /Earth/ where almost every youkai escaped,except few. Yukari sealed off Gensokyo once and forever. Utsuho being locked inside there, with that leap on Earth, all Youkai lost their powers, and begun to age. So everyone decided to write a letter to the miko, in case she is /still/ alive.