Ever since Hihi, the youkai, learned tennis from a human, he's been enraptured. An athlete he trained even reached fourth in the world. Bored with training monkeys to play, Hihi decides to train an athlete to win the gold medal at the next Olympic games. Excited, he heads into town and runs across Mana's friend Yuumi. The two hit it off, and right away start intense daily training, but soon crack begin to appear in their relationship.
The door to the unseen world opens...
...يفتح الباب إلى العالم غير المرئي
Das Tor zur verborgenen Welt öffnet sich.
Une porte s’ouvre
sur un monde invisible…
Si apre la porta del mondo invisibile.
A porta para um mundo invisível se abre.
Дверь в невидимый мир открылась...