Light Novel New Book Size Fiancee of common cuckoo (5) Aotori Bunko

Product description ※Please note that product information is not in full comprehensive meaning because of the machine translation.

Completely novelize the popular manga in "Weekly Shonen Magazine"! calm sea and Erika, who are former "children who have been mistaken" each other. Erika introduced calm sea's younger sister Sachi to Hiro, who is calm sea's half-hearted person, saying "My sister!" so Hiro knows that they are in a "fiancee relationship". Her younger sister Sachi says "I want to go to the same high school as calm sea!" but Sachi seems to have a distrust of Hiro. On the other hand, calm sea was able to discover herself enjoying barbecue, liver preservation and astronomical observation at the "study camp" in which Sion, a classmate of Erika's aim, also participated. Is there a new phase in her relationship with Erika?