Izana and the recon squad leader are pursued by an enormous humanoid gauna. Meanwhile, Tsumugi faces off against the Crimson Hawk Moth.

Nagate fights one-on-one with the heart of his enemy while the strike force does not fare well in its attack on the Gauna.

After a disaster aboard Sidonia, Nagate and his team are ordered to retrieve a valued weapon. He later defies orders to save a friend.

A large strike force encounters an enemy unit that takes them by surprise; Nagate does what he can to protect his friends.

Nagate rescues Tsumugi but is overpowered by the Crimson Hawk Moth. The situation looks grim as swarms of gauna bear down on the survivors.

Nagate is blamed for a defeat and harbors guilt over a casualty; the early years of Sidonia are revealed.

The enemy is revealed to be even larger and deadlier than previously believed, resulting in three squads engaging in a deadly fight.

The pilots and Tsumugi repair damage to the Sidonia following the Gravitational Beam Emitter incident; Tsumugi is upset for causing a minor accident.

The Sidonia's new weapon test succeeds, but the crew realizes they can't shut it down; Yuhata sends the garde pilots to investigate the disturbance.

Despite being instrumental in their victory, Tsumugi is severely damaged defending Sidonia. Izana, also critically injured, makes a bold decision.

Having disposed of the opposition, Kobayashi sets Sidonia's course to the ninth planet in the nearby Lem System. All-out war now seems unavoidable.

Evicted from his dorm and with nowhere to go, Nagate asks to stay with Izana for a night; Tsumugi has an emotional crisis triggered by a close call.

Izana finds out her 'date' with Nagate was a setup and storms home. Soon after, she is called to be part of a team that will scout out Planet Nine.

Pilot Nagate Tanikaze is now renowned for his actions in the recent battle, but Nagate is more concerned with the disappearance of the ena Hoshijiro.