Riri is elated that Yuyu is officially her new Schutzengel, but Yuyu has no intention of going easy on her Schild, delivering no shortage of tough love in the training facility and continuing to be cold and aloof.
Riri also gets to watch the Alfheim legion work. The nine-lily team who work together to bring down a low-level Huge—basically the opposite of Yuyu’s go-it-alone strategy.
While bathing with Kaede an Fumi, Riri is approached by Alfheim members, who offer some explanation for why Yuyu is the way she is: in a battle two years ago her own Schutzengel was killed. She still haunts Yuyu, noting that she’s “scared” both for and of Riri, and thus quick to turn her away.
Eventually Riri manages to focus her Magie and parry her attack. Right afterward the pair are on duty, and Yuyu makes sure to fix Riri’s tussled hair and uniform: an Assault Lily must look her best on the battlefield.
When the Huge arrives, it is a Restored, a Huge that survived previous attacks and returned to its base for repairs. Its shell is lined with the broken CHARMs of dead Lilies, and Yuyu decides that Riri will sit this one out. She says it’s because she’ll be in the way, but really it’s to avoid a repeat of what happened with her Schutzengel.
You see, Yuyu’s “Rare Skill” is Lunatic Trancer, so called because it transforms her into a white-haired berserk killing machine who will fight friend or foe until her Magie is spent. Seeing the CHARMs of fallen Lilies triggers the skill, and Yuyu goes on an unfocused rampage.
Due to the threat she poses, none of the other on-duty freelance Lilies can lend aid, but once Riri learns the rest of Yuyu’s story—that she was initially suspected of harming her own Schutzengel while in Trancer mode—she decides that she’ll be the one to break her out of it.
Riri rushes in to meet Yuyu, but when they cross CHARMs a first and then a a second time, Riri holds firm, and their Magie touches through the blades. Yuyu dismisses herself as a despicable monster consumed by hatred, but Riri tells her she doesn’t care, she’s still her sister, and gives her a hug that pulls her out of her trance.
Together they finish off the Restored, which will be restored no more. Afterward, Yuyu takes Riri to the cemetery where her Schutzengel Kawazoe Misuzu is buried. Later, in the dark of her dorm, Yuyu remembers clearly when she came out of a trance to find she’d run Misuzu through with her blade, but even then her big sister urged her to forgive herself and move forward.
Her roommate Matsuri Hata comes in, turns on the lights, mentions that she heard Yuyu sortied, and says “good work”, Yuyu thanks her, which is apparently enough of a rarity for Hata to note that she can’t recall the last time Yuyu was so nice. Clearly, the Schutzengel is working out swimmingly so far for both her and Riri.