<p>In volume two, the Sidonia has engaged a new type of Guana. This armored-type is strangely aggressive, and most of the young pilots who have confronted the monster are not prepared for this change in stragedy. <br><br>Rookie pilot Nagate Tanikaze has even fewer completed flight-hours, but that does not prevent him from devising his own plan of attack when his squadron is in danger. Feeling the stirrings of a bond that is precarious at best given that humanity itself is in peril, he ignores orders to save a colleague left behind.<br><br>And then upon returning to the Sidonia, the history of the Guana is revealed to Tanikaze, not long before battle and a rival's jealousy leaves him alone in space again.</p>