My Friend's Little Sister Has It in for Me! Volume 9 (Light Novel): Volume 9

Too bad he's still in the middle of a class trip!

Mashiro goes on the offense and invites Akiteru on a date to a theme park, and Iroha's mother greets them with open arms... But why the heck is Iroha there too?

Akiteru just wants to catch a break for once! Aren't theme parks supposed to be fun?!