Twintail devotee Souji Mitsuka is pulled into a war when monsters from a parallel world start stripping the twintail attribute energy out of everyone on Earth. Twoearle, an otherworldly woman who arrives with the technology to fight back, hands him the Tail Gear, which transforms him into Tail Red, a twin-tailed girl warrior. This manga retells the premise of the original Twintail light novel as its own storyline, following Souji's fights to keep the hairstyle he loves out of enemy hands.