Ep. 3: Sidonia heads to Lem Star System while Tsumugi faces a hidden Gauna threat.
Aired on April 25, 2015

Following the destruction of the Immortal Assembly, Kobayashi directs Sidonia toward the Lem Star System to chase the Gauna mothership endangering Lem VII colonists. Yure recalls Kunato’s revelation that he created Tsumugi using human DNA on Placental Shizuka, who appears pregnant once more. Yuhata encounters Nagate and Izana, eventually forming a friendship with them. Later, as Tsumugi prepares for joint exercises, she spots a large Gauna that has stealthily assimilated a colonist ship. She launches a solo attack, but the enemy constructs a massive trap. Consequently, a platoon of 96 Guardian Pilots, including Nagate, departs to rescue her from the ambush.
Episodes
- Ep. 1 · Kunato and Mozuki are trapped by parasites and forced to control others while Nagate faces loss and battle.
- Ep. 2 · Tsumugi reveals her Chimera nature after battle while Kobayashi secures research data
- Ep. 3 · Sidonia heads to Lem Star System while Tsumugi faces a hidden Gauna threat.
- Ep. 4 · Tsumugi shields Sidonia from a Gauna beam while Nagate destroys the main core.
- Ep. 5 · Izana and Tsumugi receive prosthetics and regeneration while Sidonia arrives at Lem Star System
- Ep. 6 · Nagate seeks housing near Tsumugi while the Gravitational Beam Emitter test concludes with unexpected tentacle growth.
- Ep. 7 · Guardians manage a weapon malfunction while pilots face new armor tests and personal revelations.