On her way to school one morning, a boy from another school gives Himeno a love letter. The sudden turn of events has Himeno bewildered, and behind her bewilderment likes a traumatic memory from her childhood. What happened in Himeno's past? Himeno and Nozomi have come to Kyoko's house for a study meeting. As they're working, something strange happens...
Nothing ordinary about 
that security, though!
!ولكن تلك الحماية ليست عاديّة
Aber die Security
ist nicht normal.
No hay nada normal con la seguridad.
No hay nada normal con la seguridad.
Però non c'è niente di normale
in quella sicurezza!
Não tem nada de comum
em toda aquela segurança!
Уровень безопасности совсем не обычный!