|Measurements||Height: 159cm, Weight: 50kg|
|Hair||Ahoge, Brown, Short, Sidehair, Spiky Bangs, Straight|
|Body||Pale, Slim, Teen|
|Clothes||Ankle Boots, Blazer, Necktie, School Uniform, Shirt, Trousers|
|Personality||Altruistic, Boku, Kind, Loner, Low Self-esteem, Proactive, Shy|
|Role||Cousin, Friend, German, Half-Japanese, High School Student, Son|
|Engages in||Cooking, Reading|
|Visual novels||Ef - A Fairy Tale of the Two.|
> Side character - r389:ef - the first tale.
> Protagonist - r599:ef - the latter tale.
> Protagonist - r3111:ef - a fairy tale of the two. (ef Lite)
> Protagonist - r6048:ef - a fairy tale of the two. - Regular Edition
Protagonist - Tenshi no Nichiyoubi "ef - A Fairy Tale of the Two." Pleasurable Box
Protagonist - ef - Second Fan Mix
|Voiced by||Ikagawa Shion|
Ikagawa Shion (Partially voiced)
Renji Asou who is half German, half Japanese is a protagonist of the third chapter in Ef: The Latter Tale.