It's nighttime at the Irido residence. Yume has somehow found herself with Mizuto's boxers in her possession. If Mizuto were to find out, it would almost certainly mean she would have to face the punishment of admitting to being the younger sibling. Hoping to avoid this outcome, Yume waits for Mizuto to fall asleep before heading to the bathroom to return his underwear to the laundry basket. But who does she pass in the hallway, but a bewildered Mizuto, mouth agape, with Yume's very own bra dangling from his grasp.
If she became my older sister, 
I'd wanna do so much for her.
،إن صارت أختي الكبيرة
.فسأرغب بالقيام بأشياء عدّة من أجلها
Ich wär so gern als
große Schwester für sie da!
Si fuera su cuñada,
haría de todo por ella.
Si fuera su hermanita mayor,
haría de todo por ella.
J’aimerais faire un tas de choses
avec elle en tant que sœur !
Se diventasse mia sorella, 
farei un sacco di cose per lei.
Queria fazer muitas coisas por ela
se me tornar a irmã mais velha dela!
Будь она моей старшей сестрой,
я столько бы для неё делала.