My Friend’s Little Sister Has It In For Me! Volume 8 (Light Novel)

It's time for the biggest event of any high school career: the class trip! With Iroha out of the way, Mashiro's more determined than ever to deepen her (fake) relationship with Akiteru. Sucks for Mashiro, though—a third girl is now vying for Akiteru's affection! And Iroha's launched into a long-distance offensive to pester him, but will that be enough for her? With so much trouble brewing, this “relaxing” trip to the hot springs will be anything but!