Prior to her career as an adult entertainer, Sawaguchi was employed at both a coffee shop and a clothing store. She also worked for a private tutoring center. Claiming that she has always loved to be photographed, she entered the adult film business in 1996.
In a country where AV idols can become major celebrities, Miki Sawaguchi quickly gained many fans, and became a presence in the mainstream Japanese media. She rose to stardom in the 1990s, soon becoming one of the most popular Japanese big-bust adult video stars in the world. Miki made her AV debut in January 1996 with a video for the Crystal-Eizou studio entitled I Have Found Breasts Larger Than My Face (顔よりデカイの見っけ) The video saw her partake in three sex scenes said to be inspired by her real-life love making experiences during and after high school. In an interview on that video Sawaguchi says that she was very shy during her first sexual encounter, and had to be guided throughout most of it by her much older partner.
One of Miki Sawaguchi's most successful videos, Dynamite Breast Girl - Uru Tora no Chichi, released in March 1996, has a cover featuring Sawaguchi in a small blue bikini, and it has become a collector's item in and outside Japan. This third production of hers features, again, three sex scenes, where this time Sawaguchi is dominated by her different sex partners.
After a few more videos in 1996 for Crystal-Eizou, the Osaka-based talent agency Yoshimoto Kogyo convinced Sawaguchi to retire from the AV industry and become a media personality. Although such a move was risky considering Sawaguchi's background in porn, the agency was convinced she could pull it off since by 1997 Miki had already had success as a bikini model in weekly magazines and as eye candy on adult-themed TV shows. For a short time, in 1998, Miki Sawaguchi held her own radio program and was a guest on several talkshows, such as Downtown DX.
In October 1997, Miki Sawaguchi returned to the adult video industry with the production of Come Back to Ultra Breasts. In her opening speech within this video, she describes the Japanese media/entertainment industry as a "dark and dirty world" that unheartedly destroys people's careers. In contrast, she describes the porno industry as a place she feels right "at home."
In Miki Sawaguchi's productions following her return to AV, she is more articulate than in her earlier work and she often speaks to her audience regarding her personal life and her views on sexual intimacy. For instance, in White Princess, she says that all of her experiences having sex on film have driven her to develop sexual techniques that can fully satisfy her on-screen partners.
The Summer 1999 issue of the U.S. magazine Oriental Cinema featured a review of Miki Sawaguchi's video Dynamite Breast Girl - 101 cm J-Cup with images of her on the front, back and inside covers. The reviewer calls this video "the best X-rated Japanese video I've ever seen…", further stating, "Miki Sawaguchi one of the sexiest women in Japan."
Following her return to AV Sawaguchi also entered the music industry by releasing her own album, titled Big Boobs, on the Alchemy Records label in February 2002. The last song on the album, Watashi no Mune de Onemurinasai ("Sleep with Your Head in My Chest"), was also the subtitle of the album. The album was successful enough for her to contribute vocals on a second Alchemy release entitled Uterus and Human. With her guitar noise band, Sawaguchi performed in New York's Knitting Factory on November 18, 2000.
Miki Sawaguchi is currently working infrequently on the JAV scene, making a few videos befitting her "jukujo" (mature lady) status, such as the 2004 release, Remembrance of Lewd Tits and a series of videos for the "mature woman" specialist studio Madonna. In August 2006, Sawaguchi started an online diary which she continues to maintain. Eleven years after her AV debut, Tokyo Topless, a Japanese big-bust website which is updated about once a month, gave Sawaguchi her seventh featured appearance on April 27, 2007.
As of 2013, she is billed at the Yoshiwara soapland Tiara.The Prez & His Secretary (Oshioki 3)
30 DVDs, 24 VHS tapes listed at Japanese Amazon.
Regular castYOUNG (TV Tokyo)
Special appearancesDonmai! Sports & Wide Show (Japan TV)
Down Town DX
Hare Hore Burlesque (TBS)
Oh, Divine Vocation! (Tokai TV)
Takeshi's Everyone Is Picasso
TV Jan! The News Even Monkeys Can Understand by Shinsuke
Windy Down Town (TV Asahi)
130R Monthly (Bunka Broadcasting)
B (Boobs) -101 (Regal Publishing)
DE LA PIN
Video Boy (GOT Corp.)
Girl Friends (Wakao Publishing)
Top Ten & Grace
Weekly True Story
Shocking Readers' Column (Imagine)
AV Idaten Information (Taiyō Library)
Weekly Playboy (Shueisha)
Urecco (Million Publishing)
Hot Dog Press (Kodan Publishing)
The Best Original (Hello K Entertainment)
wooooo! (Magazine Magazine)
Amateur Photos (Sun Publishing)
The Hit (Miwa Publishing)
Flash (Kobun Publishing)
Exciting Scholar (Scholar Publishing)
Weekly Taishu (Futaba Publishing)
Gals DEE (Dia Press)
4 books listed at Japanese Amazon.