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Football Coach (tentative name) is a football coach that appeared five years ago in the Nakano quintuplets' flashback. He seems to have known a lot about the quintuplets and usually ask them to help him with football practices. He had a crush on the quintuplets' mother, Rena Nakano.
The football coach is a short middle-aged man with shaggy hair. He wears a football uniform that greatly resembles the FIFA code of the Argentina national football team. It could be said that he is the author's rendition of the legendary football player Diego Maradona in his prime.
He shows an interest in Rena Nakano and little is known about his relationship with the mother of quintuplets, but Nino replies that he would not stand a chance, due to the number and successful and intellectual suitors.