Nine former members of a high school baseball team reunite for the first time in seven years, invited to meet again by an unknown figure. The friends begin to reminisce about times gone by, but soon realize that there are discrepancies among their memories. When they decide to open an old time capsule to dig up the truth, they find that the box they buried now has ten keyholes instead of nine; a mystery that only a tenth person could have the answer to.

9/10

Yuka and Makoto study in the same school, they adore one another. One day, their parents announce their remarriage. They become brother and sister suddenly. Now they cannot get along as they wanted. Meanwhile, Makoto’s tutor appears and affect their relationships. Since then the situation is only getting uncontrollable…Junichi is deeply in love with Eriko, but they are blood-related brother and sister. One day, an accident causes Eriko loses all her memories. Eriko even can’t recognize Junichi. Junichi decides to hide their true relationship and begin dating with Eriko…