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Hisako Reizei (冷泉 久子, Reizei Hisako) is a resident in Ooarai City. She is the grandmother of Mako Reizei, and her only surviving family member.
Mako Reizei's parents both died in an accident whilst Mako was still in elementary school, leaving Hisako Reizei as her only remaining family member. Hisako thus took care of Mako until she entered middle school. She frequently plays pranks to scare Mako, and the two fight often, but nonetheless have a close relationship.
Hisako collapsed for an unspecified reason in the midst of Ooarai's match against Saunders, and was transferred to Ooarai. With the aid of a Kuromorimine helicopter, Mako Reizei and Saori Takebe rushed back to Ooarai City to watch over her. Miho, Hana and Yukari returned along with the school carrier and were able to visit the following morning, whereupon they met Hisako, and she learnt that Mako had taken up Sensha-dō.
Hisako was discharged from hospital during Episode 9, and made sweets to encourage Anglerfish Team. She came to watch the finals against Kuromorimine. She also was seen spectating the match between Ooarai and Selection University.
Hisako is a short, elderly woman who first meets Anglerfish Team in hospital, where she wears a purple nightshirt. Once discharged, she attends Ooarai's Sensha-dō matches wearing a green gown with a purple purse. She ties her greyed hair into a bun, and moves with the aid of a walking stick. During moments of extreme happiness, she is seen to scorn the stick and dance around with it.
Although she comes across as cranky and stubborn when she first meets the Ooarai girls, Saori puts this down to her 'high spirits' and the annoyance of being cooped up in hospital after her fall. Irrelevant of their arguments, she cares deeply for Mako, and only asks Miho to take care of her whilst she is away on the school ship. Hisako shows her kindness by making and sending sweets to Anglerfish Team as soon as she returns home, in thanks for visiting her at the hospital.
Despite her initial reaction to Mako's participation in Sensha-dō being aloof and annoyed at the fact that driving tanks "doesn't pay the bills", she is shown to respect Mako's activities and attends all of Ooarai's Sensha-dō matches.
In the spin-off manga Motto Love Love Sakusen Desu! Hisako's more playful, cheekier side is shown, as she frequently plays practical jokes on Mako. It is implied that she is nonetheless grateful to her granddaughter for coming to take care of her whenever she can.
- Hisako Reizei allegedly has heart problems, which possibly contributed to her collapsing in Episode 6.
- She is one of the few people or things that is capable of getting Mako out of bed early.
- Mako's main motivation for finishing school is so she can devote time to looking after Hisako.
|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|
|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 ♦ Siko|
|Pravda Girls High School||Katyusha ♦ Nonna ♦ Klara ♦ Nina ♦ Alina|
|Kuromorimine Girls High School||Maho Nishizumi ♦ Erika Itsumi ♦ Koume Akaboshi ♦ Ritaiko ♦ Geshiko ♦ Sangou ♦ Mauko ♦ Sheska|
|Chi-Ha-Tan Academy||Kinuyo Nishi ♦ Fukuda ♦ Haru Tamada ♦ Hosomi ♦ Nagura ♦ Hamada ♦ Teramoto ♦ Ikeda|
|Jatkosota High School||Mika ♦ Aki ♦ Mikko|
|Tatenashi Girls High School||Shizuka Tsuruki ♦ Rin Matsukaze ♦ Haruka Endou|
|Bonple High School||Jajka ♦ Uszka|
|BC Freedom High School||Asparagus ♦ Moules ♦ Bordeaux|
|Maginot Girls Academy||Éclair ♦ Fondue ♦ Galette ♦ Madeleine ♦ Colombier|
|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|
|Panzer II Crew||Kashiwaba Sisters|
|West Kureouji Grona Academy||Kiri Shiratori|
|Selection University||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|