Chuunibyou demo Koi ga Shitai! - Summer-Summer (Doujinshi)

Yamada is a castaway on an island without any ships passing by and he is unable to recall why he is there. After finding his sports bag, he assumes he was on a school trip. With only seven days worth of food, he eventually decides to make a boat to leave the island. He thought he was alone on the island until finding a girl named Imaise Chika eating his food. They then decide to continue carving the boat together. Since the boat only has room for one, Yamada decides to set off for help, but returns upon noticing that not only has Imaise put her share of rations in his bag, they are mostly untouched as well. After returning, he notices she made the oar out of a fishing lance and he decides they can live on the island longer.

Katsuko, the daughter of a prestigious line of butlers that has served the Ootori family since long ago, now has to deal with the heir of the Ootori family and also the principal of High school that Katsuko attends. Her life is becoming more and more busy than usual because she has to serve the eccentric young master plus attend to High School as a normal student.