Info: After his little sister's birth, Saeki Koshiro's parents soon divorced, and the siblings went their seperate ways. Ten years have passed since then, and Koshiro now works as a matchmaker at a local marriage counselling office. One tiring day, Koshiro leaves for work as usual, but on the train he notices a very cute young school girl who dropped her pass. As the girl stepped off the train, he chased after her to return her pass. It was then that Koshiro felt like the world stopped, as the gentle cherry blossoms swirled in the gentle spring wind around the girl's small figure, and he realized that spring had finally come. The girl thanked him, and they soon went their seperate ways. As fate would have it, after work, Koshiro recieved tickets to an amusement park, and on his way home he meets the young girl once again. He tries to give the tickets to her, but he ends up going to the amusement park with her, where certain "events" take place. After a tiring day of work, and a nauseating time at the park, Koshiro finally starts to head home, but not after he sees the young girl meet up with yet another older man--Koshiro's own father. "Are you my brother?", the girl asks, and it was then that Koshiro wished he would just dissappear. Brother and sister seperated for a decade, reunited under unique circumstances, with an age gap that speaks for itself. Like strangers, yet related in blood, their interesting relationship starts here.