Kirika Sendō attends Kamui Daimon Comprehensive Academy as a Class 2-5 student and serves as the LBX mechanic for the Fourth Platoon. She first appears when homeroom teacher Reina Mito introduces new students Arata Sena and Hikaru Hoshihara, and later resurfaces during Mito's introduction of Yuuji Nishimura and Takao Ooyama. As the younger sister of Daiki Sendou, she shares his hobby of predicting the future through tarot cards using a CCM app, highlighting her interest in mystical or strategic pursuits. In gameplay, she becomes recruitable after clearing the "Tandem Harbor" mission, starting at Level 20 with an SC Cost of 28,150. Her manufacturing expertise specializes in Wild Frame armor types, and she pilots the LBX model Joker while demonstrating proficiency in specific armor frame levels.