Eiji meets Rin's younger sister Ayaka, who sheds some interesting new insights about her big sister right before summer vacation begins.
that felt a bit like complimenting 
an actual sister's swimsuit,
‫أن ذلك بدا وكأنني أُجامل ملابس سباحة أختي الحقيقية،
Parecia que eu estava elogiando
o biquíni da minha irmã...
я как будто обращался к сестрёнке,