Library

Yusha, a lovelorn girl, unexpectedly found a boyfriend falling from the sky after she posted a letter into the mailbox. At first she resisted and doubted him, but in the end she couldn't live without him. But Yusha gradually discovered that all this was just a mission for him. . . . You who came from the mailbox will never leave me in this life.

A Monkey's Way to Become an Immortal