At 19 years old, Hoshino debuted at
ReMix Golden Gate 2001 on , defeating four-time national judo champion, 1993 and
1998 silver medallist and three-time World Cup winner,
Russian Tatyana Kuvshinova via
KO. Hoshino got another KO victory against Akemi Torisu, whom she defeated on at
Smackgirl: Starting Over. At
Smackgirl: Fighting Chance on , Hoshino defeated Mika Harigai with a
guillotine choke submission. Hoshino got her second victory via guillotine choke against
Mari Kaneko on at
Smackgirl: Indeed. Continuing her
undefeated streak, Hoshino defeated Mako Ito by submission (
straight armbar) on at
Smackgirl 4: Burning Night. Hoshino's first and only unanimous decision win came on at
Ax Vol. 1: we do the justice, where she defeated women's MMA pioneer
Yuuki Kondo. On , Hoshino was defeated for the first and only time by then debutant
Yuka Tsuji via armbar submission at
Ax Vol. 2: we want to shine, an upset at the time, when Hoshino was the most accomplished female Japanese MMA fighter. Hoshino rebounded with a TKO victory over Yoshiko Onoue on at
Shooto Gig East Vol. 8. Hoshino submitted Hiromi Oka with a scarf hold armlock on at
Ax Vol. 3. At
Ax Vol. 5, Hoshino won against Tomomi Sunaba when Sunaba illegally kicked Hoshino in the face while she was on the ground, getting disqualified for that action on . On , Sunaba drew with
Dutch fighter Audrey Kruyning at
Shooto - 2/23 in Korakuen Hall. After the bout she declared that she wanted to return with her family in Wakayama and to take a rest from professional activities for a while. She has not fought since then. ==Mixed martial arts record==