: During the trip, Erika goes missing during a storm. Hiro, despite her awkward position as Nagi's girlfriend, joins the search and is the one to eventually find a distressed Erika sheltering in a store.
: At the start of the volume, Nagi and Hiro Segawa have officially begun dating after Nagi beats her in the midterm exams.
: A childhood friend of Erika named Rihito , who is also a hotel heir, appears in Okinawa. His presence and a potential proposal create significant tension and jealousy for Nagi.
: Erika drags Nagi along on a trip to Okinawa , which quickly complicates his feelings for her.
In of the manga Kakkou no Iinazuke (A Couple of Cuckoos), spanning chapters 124 to 132 , the story shifts into a major dramatic arc set in Okinawa. Volume 15 Key Events (#124–#132)
: A special Japanese edition included a mini photobook titled "Good Luck To You" ( Kimi ni ko are ).
