"Virus Deck Operation" is the twenty-fifth episode of the Yu-Gi-Oh! VRAINS anime. It first aired in Japan on November 1, 2017. It became available with official subtitles via Crunchyroll on the same day.
Aoi is aware of the battle between the Knights of Hanoi and Playmaker's group, but she doesn't know whether she should fight as Blue Angel or keep her promise to Akira and not go into LINK VRAINS. However, Emma then appears before her. What is Aoi's answer after her meeting with Emma?
Turn 1: Blue Angel
Blue Angel activates the Field Spell Card "Trickstar Light Stage". Upon activation, she can add a "Trickstar" monster from her Deck to her hand. Blue Angel adds "Trickstar Lilybell". As "Lilybell" was added to Blue Angel's hand using a method other than drawing, Blue Angel activates its effect, Special Summoning it (800/2000). Blue Angel Normal Summons "Trickstar Nightshade" (100/0). Blue Angel uses "Lilybell" and "Nightshade" to Link Summon "Trickstar Holly Angel" (2000/LINK-2/↙↘) to the Extra Monster Zone. As "Nightshade" was used as a Link Material for the Link Summon of a "Trickstar" monster, Blue Angel activates its effect, Special Summoning it from the Graveyard. She Special Summons it to the bottom-left Link Point of "Holly Angel" (100/0). As a "Trickstar" monster was Normal or Special Summoned to a zone "Holly Angel" points to, its effect activates, inflicting 200 damage to Baira (Baira: 4000 → 3800 LP). As a "Trickstar" monster inflicted battle or effect damage, "Light Stage" inflicts an additional 200 damage to Baira (Baira: 3800 → 3600 LP). Blue Angel Sets a card.
Turn 2: Baira
As there is a Field Spell Card present on the field, Baira activates the effect of "Dark Mummy Probe" in her hand, Special Summoning it (700/0), then destroying a Field Spell Card. She destroys "Light Stage". Baira then Normal Summons another "Probe" (700/0). Baira Sets a card, before activating the Continuous Spell Card "Temple of the Kings", which allows her to activate a Trap Card the turn it was Set once per turn. She can also send it and a "Mystical Beast of Serket" to the GY to Special Summon a monster from her hand or Deck or a Fusion Monster from her Extra Deck. Baira activates her face-down Trap Card "Current Corruption Virus", Tributing a DARK monster with 0 DEF to negate the effects of all monsters Blue Angel controls with 2000 or less DEF and reduce their ATK to 0 for the next three turns, while also preventing Blue Angel from activating Monster effects from her hand. She Tributes a "Probe" ("Nightshade": 100 → 0 ATK). Link Monsters do not have DEF, hence "Holly Angel" is unaffected by the effect of "Current Corruption Virus". Baira activates the Quick-Play Spell Card "Monster Restitch", Tributing a "Dark Mummy" monster she controls to Special Summon 3 "Dark Mummy Tokens". She Tributes her other "Probe". Baira uses the 3 "Dark Mummy Tokens" to Link Summon "Dark Mummy Surgical Forceps" (2400/LINK-3/↙↑→) to the Extra Monster Zone.
"Surgical Forceps" attacks "Holly Angel", but Blue Angel activates the Continuous Trap Card "Trickstar Perennial", sending a "Trickstar" monster to the Graveyard to prevent the destruction of a "Trickstar" monster by battle until the end of this turn. She sends "Nightshade" to the Graveyard to prevent "Holly Angel" from being destroyed by battle. The attack continues (Blue Angel: 4000 → 3600 LP).