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Nono is a young girl living on Mars in the distant future. After getting tired of a boring life in a quiet villiage, Nono decides to try and fulfill her dream by becoming a space pilot. She heads off towards the nearest space station in hopes of becoming a pilot but instead ends up working as a made in a small bar. Because of her clumsy nature, Nono quickly ends up in debt to the bar owner with no easy way to get out. One day, however, a group of three men come into the bar and get drunk. After getting drunk the three men decide to harass Nono. Nono is promptly saved by larka special kind of space pilot known as "Topless." Amazed at her incredible skill and prowess, Nono quickly runs after her, calling her "Onee-sama" (Big Sister) and begging to become a space pilot like her. After being shown that she can't become a "Topless" via a quick test, Lark leaves and Nono is crushed.
Later that day Nono comes under attack by a space monster, a creature bent on wiping out humanity. Luckily, Lark once again comes to Nono's rescue. However, in the ensuing battle Nono ends up being dragged into space. Thinking that she is dead, Lark goes into a rage and kills the space monster. However, it turns out that Nono is actually an android—and a very realistic one at that. After the battle, Lark takes Nono back to the Fraternity (the base of operations for the Topless) and the two of them grow closer and closer.
Nono and the Buster Machines*WARNING — MAJOR SPOILERS AHEAD*
Throughout the series, Nono is determined to become the pilot of a Buster Machine, giant robot weapons made to defend the solar system from the space monster threat. However, Nono eventually learns that she is actually Buster Machine #7. Much like Buster Machines 1-3, Nono is a special type of Buster Machine that acts as the control unit for the man-made guardian robots (previously thought to be space monsters) that defend the solar system from the true space monster threat.
Nono was found frozen inside of a comet by the old man she had been living with until the series' beginning. The "Nonoriri" she longs to meet was actually meant to be said as "Nonoririko" indicating that the legendary person she wanted to meet was actually Noriko from the original Gunbuster.