Paired with beautiful, outgoing gyaru Watanabe Akari for his high school marriage practical course, introverted Yakuin Jiro agrees to act the perfect couple so that they can score high enough to switch partners and be placed with their crushes.
It's no problem at all! 
He's just an old friend.
.لا مشكلة على الإطلاق! إنه مجرد صديق قديم
Ach, der ist doch nur ein Sandkastenfreund.
No pasa nada.
Es un amigo de la infancia.
No pasa nada.
Es un amigo de la infancia.
Mais non,
ce n’est qu’un ami d’enfance !
E che ci può fare?
Não há problemas! Ele é
só um amigo de infância!
Всё в порядке.
Он просто друг детства.