Alien Invasion Notes

My name is Lin Lin, and I am an ordinary high school student living an ordinary high school life. I thought I would continue to be so ordinary until I received a letter from nowhere. I was forced into that weird and weird world. A sudden rain of scarlet blood, a strange butcher holding a butcher knife, a man in a suit with tentacles all over his body, and a huge black shadow under the deep blue sea. …… I'm back. But it seems like those weird things are coming back with me.