Story

Top wo Nerae 2! Diebuster follows the story of Nono, a country girl who dreams of becoming a space pilot (or to be more precise, ‘like Nonoriri,’ the meaning of which is revealed as the series progresses) who, due to a chance encounter with an actual space pilot finds herself becoming part of the elite Fraternity. Made up of teenage pilots called Topless, and armed with quasi-humanoid weapons called Buster Machines, the Fraternity’s mission is to protect the people of the Solar System from attack by swarms of space monsters.

The series revolves around Nono’s quest to become like Nonoriri, her relationship with Lal’C Melk Mark, the first Topless she meets whom she immediately idolizes (to the point of calling her onee-sama, or big sister), and the hard work she believes she has to do to be ‘worthy’ of Lal’C's attention. It also explores her interactions with the rest of the Idols, her efforts to fit in and, ultimately, the truth to her forgotten past.

After dealing with swarms of space monsters, and the personal conflicts of the Topless themselves. The empire discovers a threat of a Real space monster and the fact that the monsters they’ve been battling up to this point were merely first generation alternate Buster Machines used to protect the human race in earlier generations. During these events, Nono’s potent powers as Buster Machine no. 7 awakens, she and the Topless do battle with the real space monster and is victorious. Nearing the end of the story, they encounter the last of the space monsters carrying a black hole and utilizing it as an energy source to warp from system to system. The empire plans to use Nono’s Buster Machine powers and the artificial Buster Machines to destroy the final Space Monster. However, Lal’C and the Fraternity find themselves useless during this time, and one of the Topless is permanently put out of commission when he has finally reached his age. With Nono’s love and encouragement, Lal’C and the remaining Topless battle the Space Monster.

This was all in vain, as the Space Monster moves closer to earth, Nono departs with the alternate Buster Machines and seemingly vanishes from the system. The empire decides to use Earth as a weapon to destroy the final Space Monster to ensure their survival. Meanwhile, Lal’C for the first time, delves into Nono’s past, How she learned to idolize “Nonoriri” and the man who found her in the depths of Space. She and the remainder of the Topless prepare for the Space Monster’s arrival and the timely intervention of Nono, who now becomes the mega android DieBuster. However, frustrated with Nono’s departure, she batters her new form “DieBuster” in a fit of rage. Only to find that she was stopping the empire from using earth as a weapon against the Space Monster. With the two girl’s resolve, and Dix-Neuf’s new Powers, they defeat the final Space Monster.

However, at the wake of their battle, the Black hole tears open due to the Space Monster’s death. Nono and Lal’C share one last moment together as sisters, their hopes, dreams and futures if they survived, and finally gives Lal’C a piece of her generator or singularity, in the form of an Origami crane, before using the remnants of the Alternate Buster Machines to warp the black hole and herself away from earth. Dix-Neuf saves Lal’C, and brings her back to civilization, she weeps at the death of Nono.

10 years later, Lal’C becomes an environmentalist and her Topless comrades have moved on from their previous life. She stays on a hill top in the Okinawan coast line, musing about Nono before the city’s lights shuts off. She stares in the starry sky, and it is revealed all along that Nono and Lal’C's time line is the setting of the last episode of the first GunBuster OVA, as explicitly said by Lal’C when she first muses about Nono. Its two pilots, Noriko and Kazumi descend from the remnants of the first ever Buster Machine, and Lal’C vowing to tell Noriko about Nono’s life and her sacrifice.

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