Entranced by surfing and the sea, Hinako Mukaimizu is a spirited girl who attends college in a coastal city with no consideration for her future career. Her life takes an unexpected turn when a fireworks mishap sets the apartment building she lives in ablaze, where she is saved by a talented firefighter named Minato Hinageshi. Upon meeting, the two quickly become acquainted with one another—Hinako is instantly enamored by Minato's reliable personality and passion for saving others, while Minato is intrigued by surfing and is eager to learn how. As Hinako begins to teach Minato about surfing, the pair eventually fall in love and begin a gentle and devoted relationship. However, while surfing may seem fun and carefree, it can still be a dangerous and unpredictable activity. This is what Hinako learns when a surfing incident completely changes her life, leaving her forced to contemplate her undecided future. In search of her own calling, Hinako begins her journey of self-discovery, keeping Minato by her side as she gradually attempts to find her purpose and ride her own wave.

With the divorce of his parents, seven-year-old Koyomi Hidaka makes the important decision to live with his father. As a researcher at the Japanese Institute of Virtual Science, Koyomi's father is involved in the investigation of the phenomenon of parallel worlds. Through his father's job, the young boy meets Shiori Satou, the daughter of another divorced researcher. Soon becoming friends, the two spend much of their childhood together. As Koyomi and Shiori grow closer together over the years, the two intend to marry in the future. However, their plan comes to a halt when their parents decide to marry each other. Now fated to being step-siblings, the two friends refuse to accept their new reality. Using their parents' research, Koyomi and Shiori escape to a parallel world to start their lives anew together, only to face repercussions that will put the very futures they strove for in danger.

DVD only episode entitled 'love fighter'. It features the whole cast but focuses on Megumi Kuryuu.

Once upon a time, there were two rival kingdoms that did not get along. Every day, they argued over insignificant matters. When a dispute over removing dog waste ultimately turned into a war, God swiftly intervened and directed the two nation's leaders to exchange the most beautiful girl and the most intelligent young man for bride and bridegroom, respectively. Saara, the princess of country A, meets the prince of country B, Naranbayar. As they pretend to be a married couple to protect the peace between the countries, they find themselves gradually falling in love. (Source: MAL News)