A huge branch of the Tree of Genesis appears in the middle of the ocean, which Samon and the others conclude to be the tree's main core. Meanwhile in the past, Aika learns all the truth from Hakase and decides that to ensure that the present stay unaltered and her powers are transfered to Megumu, she must commit suicide. Hakase tries to stop her to prevent Mahiro and Yoshino from suffering, while Aika claims that she shall kill herself with the sole intention of protecting them. After a vicious confrontation, Hakase is defeated and knocked unconscious. Upon awakening, Hakase rushes to Aika's house just to find her already lifeless body and a letter adressed to her, containing a message that shall be delivered to Mahiro and Yoshino once the Tree of Genesis is destroyed. (thetvdb.com)