Thunder 3 volume 6

After infiltrating the enemy mothership, Pyontaro is finally reunited with Futuba! The only thing standing between them and freedom is the aliens' mechanical monster, THE GRAVITEX GIGANT! In a display of overwhelming power, Pyontaro thrashes the automated assailant, only to be blown overboard by a giant laser fired from the persistent pile of scrap. Meanwhile, as the fires of war die down in Shibuya, one of the aliens who fought against the emperor makes a certain proposal to rebellion.

Volume 6 of the Thunder 3 manga series by Yuki Ikeda.