My Friend's Little Sister Has It In for Me! Volume 6 by mikawaghost

With the summer festival behind them, it’s time for Akiteru to get back to finding Iroha a friend! But nothing ever goes according to plan. What’s he to do when his friend’s little sister doesn’t seem to have it in for him anymore? How can he find her a friend she can be annoying with when she doesn’t want to be annoying anymore? When Akiteru tries to talk some sense into her, she instead talks him into competing at the school’s culture festival for the title of...Queen Nevermore?!
Akiteru’s got no choice but to set up a (fake) date for the summer festival. Will someone like Iroha really sit back and just watch? What’ll become of the Alliance in this perfect storm of trouble? And...just who will Akiteru wind up watching the fireworks with?