Time has passed since the incident at Magata Labs, and Saikawa and Nishinosono's daily life is returning.  Then one day, Shiki visits Saikawa at the university library..
She's my little sister.
.إنها أختي الصغرى
Sie ist meine Schwester.
Es mi hermana menor.
Es mi hermana pequeña.
C’est ma sœur.
È mia sorella minore.
Ela é a minha irmã mais nova.