My Friend's Little Sister Has It In For Me! Volume 9 by mikawaghost

Thanks to Midori's confession, Akiteru's finally ready to work out his feelings!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?!
Binding: Paperback / softback