When Hiyori—a young girl whose deceased father taught her the joys of fishing—headed out to sea for some alone time, she never expected to encounter another girl there. After a while, this girl—named Koharu—and Hiyori end up fishing and cooking together, getting to know each other a bit in the process. During their brief time together, Koharu discovers that the reason Hiyori went out to sea that day was her hesitation about meeting her new stepfamily that same evening. But what a coincidence! Koharu is also meeting her new family tonight! "No. It can't be a coincidence..." Follow these two 'sisters' and their new life together!