Sayoko Souma is one of the four Souma Family sisters.  She works on a part-time job as a tutor.

Episode 1 
 
Souma Kurumi no Idenshi - Kurumi's Gene 
Souma Delivery 
Souma Taxi 
 
Episode 2 
 
Souma Kurumi no Hahaoya 
Souma Kurumi no Zansho 
Kachou Souma Souko Step 2

[Website 1](http://ryoko-teduka.net) | [Website 2](http://megumi-tateishi.net) | [Blog](https://ameblo.jp/tezuka1015) | [Twitter 1](https://twitter.com/1015ryouko) | [Twitter 2](https://twitter.com/1015tateishi) | [Wiki (jp)](https://ja.wikipedia.org/wiki/%E6%89%8B%E5%A1%9A%E3%82%8A%E3%82%87%E3%81%86%E3%81%93)

She is a Japanese (primarily) adult game voice actress.

1. Soumake no Kateihoumon (槍間家の家庭訪問); Comic Megastore Alpha 2018-07 
2. Souma Kurumi no Idenshi - Kurumi's Gene (槍間くるみの遺伝子); Comic Hotmilk 2017-06 
3. Souma Kurumi no Hahaoya (槍間くるみの母親); Comic Hotmilk 2016-12 
4. Souma Delivery (槍間デリバリー); Comic Hotmilk 2019-11 
5. Souma Taxi (槍間タクシー); Comic Hotmilk Koime Vol. 1 
6. Souma Kurumi no Zansho (槍間くるみの残暑); Comic Megastore Alpha 2017-11 
7. Souma Ikka no Halloween (槍間一家のハロウィン); Comic Megastore Alpha 2017-01 
8. Kachou Souma Souko Step 2 (課長槍間繰子 STEP2); Comic Hotmilk 2019-10 
9. Ruitomo (ルイトモ); Comic Penguin Club 2016-06 
10. Tonari no Rina-san (となりの里奈さん, My Neighbor Rina); Comic Megastore Alpha 2014-11 
11. Uchi no Kazoku no Fashion ga Okashii. (うちの家族のファッションがおかしい。, My family's fashion is so strange.); Comic Megastore Alpha 2017-09 
12. Undou Shimasho! (運動しましょ！); Comic Megastore Alpha 2015-10 
13. Mamachari (ママチャリ); Comic Erochari 2011-06 
14. Kyouyou Kankei (強要関係); Comic Momohime 2006-11

Volume 1: 
1. Umi to Teisou 0 Oyako (海と貞操0母娘); Comic Megaplus Alpha 2013-11 
2. Souma Souko no Nichijou (槍間繰子の日常); Comic Hotmilk 2013-07 
3. Souma Sayoko no Nichijou (槍間沙世子の日常); Comic Megaplus Alpha 2013-10 
4. Mama wa Uwaki Yariman (ママは浮気中毒); Comic Megaplus Alpha 2014-02 
5. Souma Kurumi no Nichijou (槍間くるみの日常); Comic Megaplus Alpha 2014-05 
6. Souma Souko no Kekkon (槍間繰子の結婚); Comic Megaplus Alpha 2014-03 
7. Arishi Hi no Souma Ie: Prelude (在りし日の槍間家-prelude-); kakioroshi 
8. Souma Ikka no Kyuujitsu (槍間一家の休日); kakioroshi 
9. Teisou Kannen ZERO+ (貞操観念ZERO＋) 
10. Teisou Kannen ZERO++ (貞操観念ZERO＋＋) 
11. Kachou Souma Souko (課長 槍間繰子); COMIC HOTMILK 2018-05 
12. Souma Ikka no Satsuei (槍間一家の撮影); Comic Megaplus Alpha 2015-11 
13. Teisou Kannen 0.00 (貞操観念0.00); COMIC HOTMILK 2014-09 
14. Souma Mitsuko no Nichijou (槍間満子の日常) 
Illustration: Yumisuke Kotoyoshi, ShindoL, Sawaru Erect, Hamo 

Volume 2: 
1. Sei Valentine (性バレンタイン); COMIC HOTMiLK 2015-04 
2. Santa no Uchiage Kai (サンタの打ち上げ会); COMIC Doki! Special 2010-02 
3. Chinju no Yaotome (鎮守の八乙女); COMIC COMOMO 2008-03 
4. Limit Break (リミットブレイク); COMIC HOTMiLK 2013-04 
5. Oku-san no Himitsu Training (奥さんの秘密トレーニング); COMIC HOTMiLK 2013-02 
6. Ore-tachi no Tannin (俺たちの担任); Comic Megastore H 2012-11 
7. Tsukiai AuCon (付き合い合うコン); COMIC HOTMiLK Vol.13 
8. Tsun Ero (ツンエロ); Comic Megaplus Vol.35 
9. Ane Kosu! (姉コスッ！); Comic Megaplus Vol.46 
10. Furinzuma no Itobata Kaigi (不倫妻の井戸端会議); kakioroshi 
11. Juvenile Pornography (ジュヴナイルポルノグラフィ); COMIC saseco Vol. 1 
12. Hankouki (繁交期); Oyako Chijou Kitan 
13. Futanari Tenshi no Rakuen (双性天使の楽艶); Futanarikko Pretty! Vol. 01 
14. Muteki Senkan Elven Pirates (無敵戦艦エルヴンパイアレーツ); Tatakau Heroine Ryoujoku Anthology Toukiryoujoku Vol.13 
Illustration: Chirumakuro, Asanagi, Luna Tsukigami, Haiji Nakasone, Sugiura Sen 
Note: A live-action AV adaptation (MUDR-006) was released on November 7th, 2015.

1. Umi to Teisou 0 Oyako (海と貞操0母娘); Comic Megaplus Alpha 2013-11 
2. Souma Souko no Nichijou (槍間繰子の日常, The Daily Life of Souma Souko); Comic Hotmilk 2013-07 
3. Souma Sayoko no Nichijou (槍間沙世子の日常, The Daily Life of Souma Sayoko); Comic Megaplus Alpha 2013-10 
4. Mama wa Uwaki Yariman (ママは浮気中毒); Comic Megaplus Alpha 2014-02 
5. Souma Kurumi no Nichijou (槍間くるみの日常, The Daily Life of Souma Kurumi); Comic Megaplus Alpha 2014-05 
6. Souma Souko no Kekkon (槍間繰子の結婚, The Marriage of Souma Souko); Comic Megaplus Alpha 2014-03 
7. Arishi Hi no Souma Ie: Prelude (在りし日の槍間家-prelude-, Souma Family in the Old Days: Prelude); kakioroshi 
8. Souma Ikka no Kyuujitsu (槍間一家の休日, Souma Family Day Off); kakioroshi 
9. Limit Break (リミットブレイク); Comic Hotmilk 2013-04 
10. Okusan no Himitsu Training (奥さんの秘密トレーニング, Wife's Secret Training); Comic Hotmilk 2013-02 
11. Oretachi no Tannin (俺たちの担任); Comic Megastore H 2012-11 
12. Tsukiai Goukon (付き合い合コン); Comic MegaMilk Vol.13 
13. Seijun (清純); Comic MegaMilk Vol.3 
14. Ane Kosu! (姉コスッ！); Comic Megaplus Vol.46 
15. Tsun Ero (ツンエロ); Comic Megaplus Vol.35 
16. Furinzuma no Itobata Kaigi (不倫妻の井戸端会議); kakioroshi
 
Note: A live-action AV adaptation (MUDR-006) was released on November 7th, 2015.