Akira Gunji, a first-year high school student, comes across an aged lady during his journey back home. The woman sprouts tentacles from her back, signifying her presence as an extraterrestrial being. Amidst his bewilderment, Akira encounters Shou Tenkuubashi, his classmate, who is determined to capture the alien. Tokyo becomes the backdrop for their story as they encounter extraterrestrial life.