Ep. 5: Izana and Tsumugi receive prosthetics and regeneration while Sidonia arrives at Lem Star System
Aired on May 10, 2015

Izana receives prosthetic replacements for her lost right arm and left leg, while Tsumugi undergoes regeneration in a special chamber. Nagate feels depressed about Tsumugi's condition but recovers his spirits upon learning of her full recovery. Sidonia reaches the Lem Star System to confront the Gauna, firing retro-thrusters to decelerate. This maneuver nearly kills Nagate and Izana while they explore tunnels, but it allows Tsumugi to view the Residential Area via probe, bringing her joy. Back at the dormitory, Nagate is informed that his room is reserved for another cadet, requiring him to relocate. He subsequently asks Izana to let him stay at her house, surprising her.
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.
- Ep. 8 · Nagate and Izana encounter Yuhata at home before Yure seeks Sasaki's help regarding the emitter test.
- Ep. 9 · Izana replaces a deserter and battles a new Gauna type while Nagate watches helplessly.