Love, Chunibyo & Other Delusions! Take on Me

Pretty much the two main characters go on a last ditch effort trip to escape the sister, and ultimately try to spend as much time together as they can.
Yuuta and Rikka are in their third year of high school. One day in Spring, Touka declares that she will take Rikka to Italy with her, as her job has stabilized there and thinks they should migrate together as a family. Touka is also worried about Rikka not being competent enough to advance to universities in Japan. The gangs from the club suggested Yuuta, who doesn't want to be separated, to elope with Rikka!! A runaway drama throughout Japan begins.