TV-Series
Description
Kourin Tatsunagi stands as a central figure in the Cardfight!! Vanguard High School Arc. She balances her life as an international idol with Team Ultra-Rare alongside a serious, grounded persona in daily interactions. Initially, she challenges prospective members to earn entry into the Miyaji Academy Cardfight Club, determined to preserve its integrity and prevent it from becoming merely a gathering place for her admirers.

Her family connections place her as the younger sister of Suiko Tatsunagi and the older sister of Rekka Tatsunagi, though alternative media portrayals suggest they may not be blood-related. She follows the directives of Takuto Tatsunagi, transferring to Miyaji Academy on his orders to experience public life, though his motivations remain unclear to her initially.

Kourin's combat style evolves dynamically. She initially employs Royal Paladin, Oracle Think Tank, and Angel Feather decks before adopting Jewel Knights at Miyaji. Her strategies often focus on critical triggers and aggressive formations, like powering up Fang of Light, Garmore by accumulating Snogal units. After being affected by the Reverse phenomenon, she wields Broken Heart Jewel Knight, Ashlei "Яeverse", gaining abilities to retire opponent units and superior call reinforcements. During critical confrontations involving Aichi Sendou's capture, she switches to Link Joker, using units such as Star-vader, Garnet Star Dragon and Companion Star Star-vader, Photon to lock opponent rearguards.

Her relationship with Aichi Sendou significantly shapes her development. After Takuto seals her original memories, the new memories forged with Aichi and the Cardfight Club become deeply cherished. When reversed, her feelings manifest as a possessive desire to claim Aichi through reversal; however, she ultimately cannot bring herself to harm him during a critical confrontation, fleeing into the forest. Following Takuto's reversal, she experiences memory loss again, later regaining these memories upon hearing Aichi's tormented voice, which transports her to the Sanctuary.

During the Link Joker crisis, Kourin fiercely dedicates herself to protecting Aichi, absorbing portions of the Link Joker miasma from him to alleviate his suffering, knowingly compromising her own safety. She allies with the Quatre Knights to shield Aichi, confronting former allies like Kai Toshiki and utilizing Link Joker powers while not being reversed herself. Her efforts culminate in an intense duel against Kai where she confiscates Blaster Blade, intending to return it to Aichi.

In the High School Arc Cont., specifically during the Vanguard Koshien finals, Kourin experiences profound emotional resonance with Naoki Ishida's passionate performance against Kouji Ibuki. Following the tournament, she requests an exhibition match against the reigning champion Miyaji Academy club. Her journey concludes with a return to Team Ultra-Rare alongside Suiko and Rekka after the Sanctuary's collapse, where she briefly glimpses Aichi near a river.