Ep 20. Moment of Annihilation, Darkness of Extinction

"Immediately after learning Naotaka is actually Tomoharu from the first world and this world's Tomoharu died in that plane crash three years ago, Tomoharu and the other members of the Science Club find themselves under arrest by the Student Union. During the Student Union's investigation, the mysterious masked woman strikes again and makes off with Ania. Tomoharu and the others seek Toru for help, but their assailants seem to have predicted their actions and pay a visit to the Third Student Council first. With no choice but to turn Tomoharu over to their attackers, the Science Club finds an unexpected ally in the GD assigned to kill Hiwako, Yo."