Futaro is hospitalized for a while after falling sick at camp school. He returns to work tutoring the quintuplets, only to realize someone has fallen way behind.
Those two have known each 
other since they were little.
Ils sont amis depuis l’enfance.
Quei due si conoscono da quando erano piccoli.
Aqueles dois são amigos de infância.
Они знакомы с самого детства.