Laura appears in the nick of time to protect Ichika and Madoka flees. Some time later, Charlotte is assigned to perform some escort job and with the other girls all busy, Ichika offers himself to assist her. While dealing with some attackers, Ichika protects Char from an explosion and back at the academy, his Byakushiki is confiscated after displaying some abnormal behavior. With instructions to not fill the others about it, Char decides to watch over Ichika by herself as long as he is defenseless, but she comes into another predicament when her panties vanish mysteriously. Charlotte then discovers that changing her underwear does not solve the problem as it vanishes as soon as she puts it on, thus she is forced to keep going commando even at the risk of Ichika figuring out. Noting that something is wrong with her, Houki, Cecilia and Lingyin manage to have her reveal all the truth and the three start fighting for the right of becoming Ichika's bodyguard until Tatenashi appears to reprimand them for causing a commotion inside the school. Just when Charlotte decides to reveal the truth to Ichika, Laura appears and confirms that her panties had returned as the interference causing malfunctions of both Ichika and Charlotte's IS had subsided. Back at their room, Laura points out to Charlotte that all her troubles could be averted if she had put on a bloomer instead of panties, much to her chagrin.
「織斑マドカ」と名乗る少女の出現、ファントム・タスクの影……。一夏の周りに不穏な空気が立ち込める中、白式の装備が呼び出せなくなるという事態が起こってしまう。
自らの意志でボディーガードを買って出るシャルロットだったが、そんな彼女自身にも信じがたい異変が起こる……！？
이치카를 습격해온 의문의 적, 오리무라 마도카. 라우라의 도움으로 이치카는 간신히 위기에서 벗어난다. 그리고 얼마 후 샤를의 IS 장비 호송임무를 돕던 이치카는 IS 사용에 치명적인 결함이 발생하고 마는데...
