"Alien Girlfriend" is an original song by 40meterP featuring Fukase. The song begins with a man seeing the arrival of a green squid-like alien landing on earth whom he fell in love with at first sight. He then tells the alien how he feels about her, the alien replies with a high frequency sound and the man assumes that the alien feels the same way about him and she becomes his alien girlfriend. The two later go on their first date, meeting in front of the Hachiko statue. Everyone who passes by looks at the alien surprised and frightened but the man believes they are staring at the alien because of how beautiful and unique she looks. The man soon talks about how great she looks.
It is soon revealed that the alien is a princess by M04 who begins a rescue mission to return the princess to her planet. The alien is later returned to her planet, Squid Ink Planet, by M04. The man now spends his time looking for her.