Your little sister, Natsuki, suddenly shows up in the middle of your busy days. Apparently she came to take care of you while she was on her summer vacation. This is the story about you and Natsuki one summer
Did you forget what your 
little sister looks like?
أنسيت مظهر شقيقتك الصغيرة؟
Schon vergessen,
wie deine kleine Schwester aussieht?
¿Olvidaste la cara de tu hermana menor?
¿Olvidaste la cara de tu hermana pequeña?
T’as oublié
à quoi ressemblait ta sœur ?
Non ti sarai mica dimenticato della tua sorellina?
Você se esqueceu da sua irmã?