|Name in Japanese||瀬戸 蓮|
|Rōmaji Translation||Seto Ren|
|Voice Actor (Japanese)||Makiko Nabei|
|Voice Actor (English)||Stephanie Young|
Ren Seto (瀬戸 蓮 Seto Ren ) is Sun Seto’s mother & Gōzaburō Seto’s wife. She likes to encourage Sun and Nagasumi's marriage (the only other being Masa). The most feared member of the Seto Group she usually tries to keep her husband and any other Seto Group members in check, often handing out extreme forms of punishment if they step out of line and has the final say on all matters. She also enjoys teasing Nagasumi, whom she thinks to be cute. She transfers with several other members of the Seto Group to Nagasumi's school, becoming the new school nurse.
Like her daughter Sun, when Ren enters chivalry mode, pink flower petals can be seen falling and the song "Namida Ichirin" (Ren-san version (-蓮さんver.-)) can be heard in the background. Ren on appearance is seen as a kind and gentle person but shows behaviour much like a Yakuza member. Her name Ren (蓮) literally means lotus flower.