|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 the wife of Gōzaburō Seto and the mother of Sun Seto. Ren likes to encourage Sun and Nagasumi Michishio's marriage (the only other being Masa). She is the most feared member of the Seto Group, who usually tries to keep her husband and any other Seto Group members in check and often hands out extreme forms of punishment if they step out of line and she 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 and becomes the new school nurse.
Ren is a kind and gentle person but she shows behavior much like a Yakuza member.
- The name Ren means "lotus".
- Ren's surname Seto means "Riffle" (se) and "Door" (to).
- Like her daughter, 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.