Rekka is just starting to think that things have quieted down a bit, and that he might actually get a chance to be a normal high schooler for once. Who knows? He might actually study for his upcoming midterms. One phone call from Hibiki, however, is all it takes to send things spiraling out of control. It turns out Chelsea has a friend who’s come into a very strange problem. But wait, where did this samurai come from? And how is Atlantis involved? So much for midterms, because Rekka’s about to dive deep on this one!Â

It’s fall, which means it’s time for Mitsuhashi High’s annual school festival! Things are special this year because it’s being hosted in conjunction with Hibiki’s school, which means extra fun... and extra work. President Momone ropes Rekka into helping with the festival preparations, which turns out to be more than he bargained for when they get sucked into a video game world. Then there’s the bomb threat, the duel, and... Only one thing is for certain—this is going to be a festival to remember!

Rekka is now officially caught up in his grandest, most dangerous story yet— this time it’s his job to help save the future that he screwed up. The first step to doing that, as far as he’s concerned, is rescuing the kidnapped heroines. But that’s going to be a little trickier than imagined, because the heroines in the future aren’t exactly the ones he’s used to. Can he save them all while managing to keep himself in check? The dangers increase by the moment as intrigue looms on the horizon.

When a midsummer heatwave rolls in, Rekka invites all of the heroines to the pool. But instead of cooling off, they find themselves in a heated contest for his attention! After that, Rekka's invited to stay at school overnight with the light literature club. It's all fun and games until he ends up getting involved in a supernatural turf war. Things finish off with a festival fireworks show in this summer-packed volume! But what's this about a special mission for R...?