Despite Kagari regaining her childhood memories of Mayuri, who is informed about her future relationship with her, Rintaro and Daru remain curious about what happened during the past twelve years that she still doesn't remember. During an argument with her, Suzuha notices a contradiction in Kagari's recollection of their separation, with Tennouji suggesting to Rintaro that it may be the result of brainwashing by a third party. The next day, Rintaro goes with Moeka to investigate an abandoned building located near where Kagari was found, discovering it to be a secret facility where Kagari was being held captive. Meanwhile, as Kagari heads towards a party held by Mayuri, she hears a song that causes more memories to resurface, at which point she starts hearing a voice and disappears somewhere.