After the first murder, Shiki's uncle, Director Shindou, is killed as well. The lab is in an uproar. To find out who the killer is, Nishinosono and Saikawa investigate Shiki's room. There they find a robot named Michiru, and a strange message saying "Everything becomes F."
How did the killer get up to the roof?
كيف تمكن القاتل من الصعود إلى السطح؟
Wie ist der Täter aufs Dach
gekommen?
¿Cómo subió a la azotea?
¿Cómo subió el asesino a la azotea?
Comment le coupable
s’est-il rendu sur le toit ?
Come avrà fatto l'assassino a salire sul tetto?
Como é que o criminoso
 foi até o terraço?