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Sanada was a young teenage boy with curly black hair and wore a big pair of glasses that covered his eyes.
Sanada appeared to have a quiet personality. Similar to Fuutarou, he was focused on studying, even doing maths during a field trip.
Takebayashi and Sanada were childhood friends. They grew up together and their parents maintained close ties. Both being class representatives, their classmates perceived the duo to be perfect for each other.