Hayato catches a cold. Mikoto, Minato, and Gakuto are eager to care for Hayato and handle the household chores. Even when they run into the Kirishima family on their way to a trip, they keep Hayato's condition a secret, not wanting to worry them before their vacation. 
And I'm also your brother...
Ich bin auch euer Bruder!
También soy parte de los hermanos.
Je fais partie de la fratrie,
souviens-toi.
E sono anch'io vostro fratello...
E também sou irmão de vocês...
Я же ваш брат.