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. 
It seems he caught a very contagious cold.
Es war offenbar eine
sehr ansteckende Erkältung.
Al parecer,
era una gripe muy contagiosa
Il a refilé sa grippe à Mikoto,
Pare che fosse
un'influenza molto contagiosa.
Parece que ele pegou
uma gripe bem contagiosa.
Болезнь оказалась заразной.