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- "Leave the rest to us!"
- "We'll use our usual..." "Bermuda Attack!"
- ―Azumi and Rumi
Rumi is one of the three Alice Shimada's vice-commanders in the All-Stars University Team. She operates an American M26 Pershing with a blue triangle on the front side.
Rumi is a short girl with short greyish-purple hair and blue eyes. She wears glasses, as is usually seen wearing the All-Stars University Team Sensha-dō uniform and hat.
It is implied in the Drama CD that she was a student at Jatkosota High School before going to University. Like her two teammates, she is terrible at cooking, in fact she does not really know how to cook like the other two, a "Hard-Drinking Party Girl", and crazy about the cuteness of her commander.
She is first seen along with her two teammates in M4 Shermans observing Alice Shimada's training match.
During the match against the Ooarai Compound Team, she commands a company of seven M26 Pershings (including her tank) and one M24 Chaffee. Rumi Company engages Team Dandelion in a long range gunfight across the wetlands, with the purpose of tying them down. The company withdraws after Ooarai destroy the Karl-Gerät 040 artillery.
She is later seen chasing the Panzer IV & the Hetzer in a maze with two Pershings and a Chaffee. After the two Pershings are taken out, Rumi notices the CV.33 on the rollercoaster acting as a spotter and presumably sends two Chaffees after it. She later reunites with her two teammates to form the "Bermuda Trio", taking out Saunders' tanks before being rammed by the T-34/85 and knocked out by the Tiger II, seconds before Azumi knocks the Tiger II out in turn.
- All three of the All-Stars University Team's Vice Commanders have names that end with "ミ" or "-mi"
- Rumi is the only Bermuda Trio failed to reach and regroup with Alice Shimada in Central Plaza due to her tank being immobilized by Erika Itsumi.
- Rumi knows Mika and her crew (Mikko & Aki), considering them the weirdest ones among all students of Jatkosota High School.
- She is the leader of the 'B' Squadron
- Main article: Rumi/Gallery
|Ooarai Girls High School||Anglerfish Team||Miho Nishizumi ♦ Saori Takebe ♦ Hana Isuzu ♦ Yukari Akiyama ♦ Mako Reizei|
|Duck Team||Noriko Isobe ♦ Taeko Kondou ♦ Shinobu Kawanishi ♦ Akebi Sasaki|
|Hippo Team||Erwin ♦ Caesar ♦ Saemonza ♦ Oryou|
|Rabbit Team||Azusa Sawa ♦ Aya Oono ♦ Ayumi Yamagou ♦ Yuuki Utsugi ♦ Karina Sakaguchi ♦ Saki Maruyama|
|Turtle Team||Anzu Kadotani ♦ Momo Kawashima ♦ Yuzu Koyama|
|Mallard Team||Midoriko Sono ♦ Moyoko Gotou ♦ Nozomi Konparu|
|Leopon Team||Satoko Nakajima ♦ Hoshino ♦ Suzuki ♦ Tsuchiya|
|Anteater Team||Nekota ♦ Momoga ♦ Piyotan|
|Shark Team||Ogin ♦ Murakami ♦ Cutlass ♦ Flint ♦ Rum|
|Miscellanous||Taiga Ou ♦ Sadoka ♦ Mazoe|
|St. Gloriana Girls High School||Darjeeling ♦ Orange Pekoe ♦ Assam ♦ Rosehip ♦ Rukuriri ♦ Nilgiri ♦ Vanilla ♦ Cranberry ♦ Earl Grey|
|Saunders Girls High School||Kay ♦ Alisa ♦ Naomi ♦ Helmet-Chan|
|Anzio Girls High School||Anchovy ♦ Carpaccio ♦ Pepperoni ♦ Amaretto ♦ Gelato ♦ Panettone|
|Pravda Girls High School||Katyusha ♦ Nonna ♦ Klara ♦ Nina ♦ Alina ♦ Ekaterina ♦ Olga ♦ Polina ♦ Natalia ♦ Lisa ♦ Mo ♦ Zemlya ♦ Neba|
|Kuromorimine Girls High School||Maho Nishizumi ♦ Erika Itsumi ♦ Koume Akaboshi ♦ Leila Rou ♦ Emi Kojima ♦ Geshiko ♦ Sangou ♦ Mauko ♦ Sheska ♦ Manami Himuro ♦ Runa Onizuka ♦ Kirishima|
|Chi-Ha-Tan Academy||Kinuyo Nishi ♦ Fukuda ♦ Haru Tamada ♦ Hosomi ♦ Nagura ♦ Hamada ♦ Teramoto ♦ Ikeda ♦ Kubota ♦ Nishihara|
|Jatkosota High School||Mika ♦ Aki ♦ Mikko ♦ Touko ♦ Lili|
|BC Freedom High School||Ribbon Warrior||Asparagus ♦ Moule ♦ Bordeaux|
|Das Finale||Marie ♦ Andou ♦ Oshida ♦ Sofue ♦ Isabe|
|Blue Division High School||El ♦ Tristana ♦ Viridiana ♦ Andalusia|
|Koala Forest High School||Wallaby ♦ Platypus|
|Bonple High School||Ribbon Warrior||Jajka ♦ Uszka ♦ Pierogi|
|Maginot Girls Academy||Éclair ♦ Fondue ♦ Galette ♦ Madeleine ♦ Colombier|
|Count High School||Noemi Kohiyama ♦ Anna Masukura ♦ Nachigami Sisters ♦ Marina Constantinescu ♦ Mizuki Ikarashi|
|Tatenashi Girls High School||Shizuka Tsuruki ♦ Rin Matsukaze ♦ Haruka Endou|
|Tategoto High School||Aung|
|Maple High School||Trout ♦ Amber ♦ Oleo|
|Kebab High School||Bosphorus|
|Bellwall Academy||Tiger I Crew||Emi Nakasuga ♦ Hitomi Yuzumoto ♦ Kita ♦ Takami ♦ Nagisa Shiratori|
|Jagdpanther Crew||Neko Yamamori ♦ Yano ♦ Koharu Sakai ♦ Kanbara ♦ Hirono|
|Elefant Crew||Chifuyu Doi ♦ Terauchi ♦ Wakasugi ♦ Kunihiro ♦ Nogata ♦ Enami|
|T-44 Crew||Youko Minami ♦ Saionji ♦ Azuma ♦ Hokuto|
|Panzer II Crew||Kashiwaba Sisters|
|West Kureouji Grona Academy||Kiri Shiratori|
|All-Stars University Team||Alice Shimada ♦ Azumi ♦ Megumi ♦ Rumi|
|Japan Sensha-dō Federation||Ami Chōno ♦ Shiho Nishizumi ♦ Renta Tsuji ♦ Chiyo Shimada ♦ Shichiro Kodama ♦ Kikuyo Idegami ♦ Kanon Sasagawa ♦ Hibiki Inatomi ♦ Remi Takashima|
|Non-Affiliated||Yoshiko Akiyama ♦ Jungorou Akiyama ♦ Hisako Reizei ♦ Shinzaburo ♦ Yuri Isuzu ♦ Chihiro Yusa ♦ Boko|