Urara Oikawa is an old friend of Shinichiro Ootori and Yuudai Yamanobe, and helped them with their investigations and plans. Though she works in the St. Mihailov Academy as a nurse, she has connections with Athos and is aware of the movements of the Qwasers. She treats the students of the academy and sometimes helps them with their personal problems or other issues (in case of the students that are Qwasers).
Urara is a calm person, usually smoking, and normally appears after an important battle to treat the injured. She has connections with Athos, specifically with Yuri Noda and seems to get on well with Mafuyu and Tomo (partly because they're daughters of her old friend Yamanobe Yuudai). She has no sexual attraction to Sasha and just enjoys teasing him just to see his reactions
She dies later on in the manga
Urara is first seen in episode 05 telling off Hana because she arrived late to class and because besides that she left the classroom with the excuse of having a supposed stomach-ache. She later has another brief appearance in episode 09 where she treats Katja's wounds of her fight with Yuu Kuchiba. After the attack of Eva Silver in the St. Mihailov Academy, Urada (while she was measuring Tomo's breasts) had a little conversation with Mafuyu about Sasha who was embarrassed because of all the fangirls and boys that wanted to call him by his alias "Sasha". Mafuyu was happy for him, but at the same time she was a little bit worried, so Urara told her that even though Sasha was experiencing something completely new to him, he would get used to it eventually.
In episode 13, Urada went with Mafuyu, Tomo, Teresa, Fumika, Hana, Katja, and a weirded-out Sasha to a hot spring. Urara tried to undress Sasha so that he could take a bath in the proper way along with the other girls, but her true intention was that she was interested in the attractiveness of his naked body, Sasha was really embarrassed so he didn't let Urara undress him. Urara is seen later having a dinner with the girls and Sasha. Later in episode 18, while Sasha was fighting with Tasuku in the academy's roof, Urara had a conversation with Mafuyu about what is better, the shape or the size (of the breasts). Two weeks after Tomo was kidnapped by the Adepts, Urara contacted with Sasha and had a close encounter with him, she later told him a little bit about who was she and what she knows about Yamanobe Yuudai, she also gave him a special book which later Sasha would use to open a secret compartment in a bookcase of the academy, which contained some documents that revealed the way to the Theotokos of Tsaritsyn.
In episode 21, Urara healed Tasuku's and Mutsumi's wounds after their battle against the adepts Jita and Milk. Though Mutsumi had the worse wounds, she wanted to provide Tasuku with her soma, Urara stopped her because she considered that Mutsumi was too weak to provide soma, so Urara offered hers, as consequence Mutsumi felt jealous and took Tasuku away. Shortly after, in company of Yuri Noda, Urara felt how her soma was taken out due to the "Sword of Maria" sealed in Mafuyu, which was recollecting soma from all the women in the world. By the end of the season, Mafuyu went to Urada's office for a check-up because her breasts were getting smaller, she asked the nurse if it was possible to make them bigger like before (when the "Sword of Maria" was activated), but Urara only laughed really hard and told her that it was impossible.
Urara returns in the second season of the series in the episode 07, after the battle in the Roman Curia Suirei Academy. She treats Jita and Yumie after Tomo found them unconscious somewhere near the St. Mihailov Academy. Urara told Tomo that Jita was OK, and explained her the functioning of the device that Jita had in one of her breasts, then, before leaving the room, Urara warns Jita not to make any fuss, because trying to use her qwaser powers could cause an accumulation of soma in her body. Time later, Urara appeared to help Tomo and Jita who were having problems with one of the thieves that stole the file that contained the body measures of all the girls in the St. Mihailov Academy. First Urara gave Tomo an elemental circuit (that looked like an egg) which transformed her into "Mademoiselle Tomo", then she started emitting/firing beams with her breasts and got rid of the thief, the problem was that she couldn't stop it until she ran out of energy. Urada said that she was glad she didn't use the elemental circuit in herself.
The school nurse had another 2 brief appearances, the first one in episode 10, where she gave Hana and Fumika a book that teaches how to get big boobs, and the second one in episode 11, where she went with Miyuri, Fumika, Jita, Yumie, Nami, and Edgar to the St. Mihailov's hot springs.
Seikon no Qwaser: Jotei no Shozo OVAEdit
Urara appears in the Seikon no Qwaser OVA titled Jotei no Shozo (or Portrait of the Empress in English) and along with Teresa made medical examinations for all the girls in the academy. She started with Katja and her classmates and used the fact that Lulu Shizaki was wearing a bra that didn't suit her to teach the young girls how to measure correctly their breasts (so they can buy the appropriate bra) and to show off her attributes. She later examined Mafuyu and her classmates and kept away Sasha and Ootori who were peeking and fighting close to nurse's office.