Born in 1993. 182cm, 79.5kg. Male. Nanami Ryusui's half-brother, he possesses a natural genius for mathematics. He once fled to India to escape Ryusui, seemingly wanting no part of the Nanami conglomerate. He has a habit (?) of running away the moment he sees Ryusui. He is kind and gentle... and a coward. While brilliant, his behavior is somewhat clumsy and airheaded. Uniquely, when he screams, he makes a sound like "Pikyak!"

A butler with an androgynous appearance who has served Ryusui and Sai for a long time. While the name is typically female, it is not unheard of for men depending on nationality or context, and given their androgynous looks, their gender remains unknown. Ryusui himself didn't even bother to remember, reasoning that as long as their skills are certain, gender doesn't matter. As a first-class chef and butler, their main areas of responsibility are cooking and hospitality. Their culinary skills are exceptional. Their catchphrase is "Desire = Justice," mirroring Ryusui. As a butler, they often display keen observation skills regarding those around them. Their age, real name, origin, and gender are unknown, but this isn't because they are keeping secrets; it's simply because Ryusui doesn't care to ask. Height is 160cm, weight is 50kg.