The BS Situation of Tougetsu Umidori, Vol. 4 (light novel)

On a fall day, Bullshit-chan takes Tougetsu Umidori to the mall. She's acting odd-and has something to tell Umidori. But the sinister Mud Hat Faction is after them! Umidori with cat ears, Bullshit-chan's Grill, an Aomori novelist, another Seiryoin, and financial gatekeeping! And at long last, learn what really happened ten years ago--Bullshit-chan's secrets revealed! What answers will that lead them to? The strangest story around reaches its climax!