Just before a date with Osanai, Kobato runs into Kengo, who shares some disturbing news and leaves a strange message. Together with Osanai, Kobato tries to solve the mystery. However, shortly after, it appears that Osanai is in great danger.
Is that a secret code between you two?
هل هذا رمز سرّيّ بينكما؟
Cos'è, voi due avete un codice segreto?
Isso é um código secreto entre vocês dois?
Так это какой-то ваш секретный код?