Choushoujo UFO

A high school boy named Shinpei shares a home with Yuha Maria, a foreigner nicknamed UFO-chan. She is an extraterrestrial officer assigned to Earth to hunt down alien threats endangering other planets. Shinpei is drawn into her mission, traveling through time in her UFO to stop an alien invasion of the future. Each time, his memories of the events are erased to keep Yuha's identity hidden. A separate comic strip titled "Professional" features a hitman tasked with eliminating mob boss Calpis Soda, encountering various absurd situations during the mission.