Two crises deep into Yotsuba's fledgling three-way relationship with Yuna and Rinka, her love life is finally reaching equilibrium. Her girlfriends approve of the unusual arrangement they've settled into, her little sisters begrudgingly acknowledge it, and it seems like life couldn't get any better...which, of course, means it's time for a new disaster to shake things up all over again!

For all the positive traits Yotsuba can't bring herself to admit that she has, it's undeniable that she also has a bad memory. Very bad. So bad that she just might've forgotten she had a childhood friend way back whenever, then failed to notice as said childhood friend became a nationally renowned pop idol, all to fulfill a promise she made with Yotsuba...which Yotsuba, of course, also forgot about. Their reunion could only possibly be more awkward if, say, Yotsuba's old friend asked her for help faking a relationship...but what are the odds of that happening?