After news of 'Red' Basilisk's imminent approach reach Midgard, Brynhildr Class and Honoka are dispatched to lure it into a deserted island and destroy it. En route to the island, Yuu and Ariella witness a confrontation between Lisa and Mitsuki over the matter of Miyako Shinomiya's death. Later on that day, Yuu is visited by Firill, who explains to him that Lisa doesn't actually hate Mitsuki at all. At night, Yuu requests for Mitsuki to tell him what happened two years ago. Mitsuki consents, narrating how she met Miyako, the details of the battle against 'Purple' Kraken and Miyako's death at her hands. After hearing the whole story, Yuu requests for Mitsuki to ask Lisa to forgive her, which she eventually agrees to. The next day, Lisa confronts Yuu for meddling in this affair and states that she will think of a very difficult condition for Mitsuki to earn her forgiveness.