[X] Keiko descends into unprecedented bout of depression, after burning out of her righteous fury. In self-flagellating act of desperation, unwilling to face her siblings or be a burden any more than she is, she reverse summons herself. She stays there until next match, which she loses due to lack of preparations or support from their more creatively-minded family. This defeat puts Keiko into a state of pure agonizing panic, which she tries to further escape by plunging herself into Frozen Skein. This act renders her comatose, leading to a whole slew of consequences, culminating in Mori Ami and Goketsu Hazou combining their forces to make a WMD capable of wiping out all realities where Keiko is dead. As their definition of "dead" includes "not there to begin with" our universe is destroyed as well.
[X] Hazou raises his hand to knock on Keiko's door, only to be tackled to the ground by a shadowy figure. It's Hazou from the future, attempting to save his past self from a terrible fate far in the future that all stems from this moment. Noburi knocks the future Hazou away and tenses to fight, but both Hazous immediately devolve into structured meaningful conversation about their goals and perspectives. After both sides have said their peace, future Hazou agrees to avert the terrible fate in a more productive way. As Hazou approaches Keiko's door again, he slips on a banana peel and hits the floor hard, rendering him comatose. Future Hazou hides the body and takes his place.