Yutaka Sō

Apparently it is a pseudonym used individually and collectively by various people working around the director and producer Kan Mukai on his films and at his production companies.

Crew

Modern Female Ninja: Flesh Hell

Dark Japanese History: Virginity and Rape

Hiden: Haragei 18-ban

Jôji no Atosaki

Zeppin no tsubo

Aru aibu!! Zubunure

Director, Screenplay

Jitsuroku: Maruhi tsûkin chijo nikki

Inhuman Man-Killing Goddess

Monzetsu kôkyû toruko: Jun nama arai

Forbidden Technique to Tie a Lady

Chikan zurousu dorobô

Blue Film Woman

Drop Out: Supple Female Leopard

Female Punisher Zebra: Sexy Edition

Virgin blues: Nurete sayônara

Girls' Dormitory

Shameful Technique

Diary of a Violated Virgin—Female

Zeppin no akujo

Jitsuroku: Maruhi Toruko jō monogatari

Savaged and Ravaged

Tortured Women's Dark History

Tattooed Slave Wife

Female Teacher: Exposed

Uniform Blackmailer

The Shocking History of the Death Penalty

Soft Skin Lynching

Groper Bullet Train

Women's Dormitory (Sexual) Crimes

Female Teacher: Violated to Death

Crying Rope, Missing Black Hair

Hometown Porn Girl 18! Seeding Festival

Shocking! A Villain's Resume

Japanese Pornography: Kawachi's Erotic Widows

Real Cabaret Performance: 40 Minutes

Danchi Tsuma Maruhi Mono Kurabe

Zeni-mesu: Tane uma: Bakashi ai

Japanese Night Crawl Festival

Groper Express: Coming Soon

Confession of a Virgin: I Want to Be Number Two

Apartment Wife: Secret Research Society

Apartment Wife: Daytime Prostitute

Inmon: Shojo tsuma kantsû

Attachment of a Virgin

Kin'yôbi no mesu inu

Night Office Lady: Pleasure Room

Inpu nobori ryû

The Flesh Clock of Men and Women

Female Punisher Zebra 2: Action Edition

Kōshoku samidare onna

Forbidden Affair

The Blonde and Utamaro: The Lewd Spring

History of Japanese Evil and Hatred

24-Hour Affair: Scream

Forbidden Love Affair

(Secret) Great Japan Obscene Stories Rare Festival

Sexual Wisdom: Male and Female

Ane imôto: Kan

A Magnificent Affair: The Phantom Woman

Flesh-Bullet Widow

Director, Screenplay

Salome Tsunoda's Agony and Ball-Breaking

Bōsō poruno-zoku on'na kari (suke kari)

Shiofuki jô-ô

Pleasure Affair

Hometown Woman Exploration: Pink Valley

A Magnificent Love Affair

Furusato gyoshoku tanbō monzetsu poruno matsuri

Sex Exchange: Young Wife's Play

Porno jôhôkyoku: Tôchô

Kigeki poruno: Taxi hanjôki

The Secret Story of the Onsen Geisha: Wet Pillow

The High School Girl Who Knew Too Much

Alumni Association

Last Dance: Divorce Ceremony

Executive Producer

History of Adultery in Japan

History of Japanese Night Crawling Customs

Furusato poruno chikubi korogashi

Red Laboratory: Please Bully Me

SM ketteiban: Kusari to mesu inu

The Scream of a Female Doctor

Agony!! Pacifier Widow

New Edition: The Complete Collection of Turkish Japan

Director, Screenplay

The Crazy Widow

Complete Collection of Naked Women's Pleasure

Director, Screenplay

Lewd Photo!! White Coat and Rope

Daylight Assault Game

Director, Screenplay

The Bizarre Rope Ritual

Nippon porno fudoki: Tsugaru hime matsuri

Bizarre Rose Makeup

Queen of Gropers

Female Teacher: Attack

Brutally Punishing a Female College Student

Night Office Lady Diary: Flesh Doll

Cruel Document: Prostitution in a House

Porno Exploration: Japanese Spring Tales

Paradise Widow Play

Screenplay, Director

17-Year-Old Document: Prostitution Reserve Force

Hometown Porn Explorations: Groper Summer Festival

Agony of Petals

When a Woman is in Agony