Viz Media is the licensor of the series in the United States. The series has not had a release in English. The series' protagonist is Takashi Horimachi (堀町 タカシ Horimachi Takashi), a fifth grader at "Anytown" Elementary School. A transfer student named Taro Tanaka (田中 太郎 Tanaka Tarō) enters Takashi's class. Taro Tanaka turns out to be a space alien. Takashi becomes obsessed with trying to figure out the origins of Taro. Takashi is just a regular fifth grader when a new student, Taro Tanaka, appears. Later Takashi realizes that Taro is an alien and tries to find out more about him. He has many adventures with Taro. Takashi soon gets into much trouble and starts to have a bad reputation because of Taro such as giving his childhood friend Kyoko an explosive bomb for her birthday (which Taro had switched with a Taro doll Takashi had meant to give Kyoko). Taro also constantly makes Takashi annoyed, like one time Taro invited Takashi to his birthday party, but Taro made Takashi walk to the end of a long hallway to go to his room (at the end of the hall was a sign that said turn around). When they went back to the beginning of the hall, Takashi finds that Taro's room was hidden near the entrance of Taro's house. Taro also makes Takashi really embarrassed like for example, Taro somehow made the entrance to a bathroom of an amusement park turn into a rollercoaster ride where all Takashi's clothes flew off and he was stuck up there the entire day, hanging on for life.