The White Room (白の部屋 Shiro no Heya) is an extra-dimensional space strongly connected to the Selector battles. After her death, Mayu came to inhabit the room as a spirit, and it is from there she monitored the Selector battles. Here, Mayu received Selectors who have become Eternal Girls and are soon to become LRIGs.

In a bid to end the Selector system, Rūko Kominato confronted Mayu in the White Room with Yuki, who battled against Mayu and Urith. After Mayu's defeat, the White Room seemingly disappeared. However, the emotions of the Selectors that had suffered under the previous system coalesced into Eternal. Due to Tama and Yuki's continued existences, the White Room continued to exist.

Throughout the second Selector system, the White Room was used to recruit new Selectors, who would meet the LRIG of the Beginning. Whenever a Selector's memories and personality disappear in accordance with the system's rules, their memories would be stored as coins inside the White Room.

After the end of the second round of Selector battles, Eternal began the third round of Selector battles, seeking a new master for the White Room to continue the Selector battles. The third system was designed to have a singular winner, who would then enter the White Room and assume their duties as its new master. Kiyoi Mizushima become the winner of the third round, but she chose to confront Eternal. After Kiyoi defeated Eternal, the White Room ceased to exist.

Lostorage incited WIXOSS
Characters Suzuko HomuraRilChinatsu MorikawaMelHanna MikageNanashiShou NarumiAya
Shohei ShiraiDonaSou SumidaGuzukoRio KoshibaMamaKagari YukinoYukime
Kou SatomiCarnivalLRIG of the BeginningKiyoi MizushimaPirulukAya Narumi
Terminology SelectorLRIGSelector BattleCoinWhite Room
Music LostorageundeletableLostorage incited WIXOSS Original Soundtrack
Lostorage conflated WIXOSS
Characters Kiyoi MizushimaAllos PirulukRuko KominatoTamaSuzuko HomuraRilYuzuki Kurebayashi HanayoHitoe UemuraMidoriChinatsu MorikawaMelHanna MikageNanashiAkira AoiMilulunDonaKaedeLaylaAyaGuzukoCarnivalRememberLRIG of the BeginningEternal
Minor Characters Shohei ShiraiShou NarumiSou SumidaKou SatomiAmika HashimotoAyumi SakaguchiMayuYukiKazuki Kurebayashi
Terminology SelectorLRIGCoinKeyWhite Room
Music UnlockILostorage conflated WIXOSS Original Soundtrack
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