Lucky, a ninja cat, arrives by boat to Champion Island, a place where athletes from across the globe set out and compete with each other. Lucky is then confronted by two Komainu, who challenge her to match of Table Tennis to test her skills. Once Lucky beats the pair, they believe her to be The Chosen One, and tell her of the seven champions of the island and that beating them would restore order to the island and make her the Island Champion.
Lucky can then choose which order to compete against the champions and beating each champion will earn her one of seven Sacred Scrolls. There are:
- The Kijimuna, a tribe that hosts marathons along a beach.
- Daitengu, who masters table tennis in a village now abandoned in a bamboo forest.
- Princess Oto-hime, who competes in artistic swimming under the water.
- Yoichi, master of archery near the island’s lotus pond.
- The Oni, a group of trolls who are champions of the island’s rugby. In this event, Lucky is aided by Momotaro and his friends.
- Fukuro, an owl who sits at the top of the island’s mountain and observes the Climbing event.
- Tanuki, the master of the Skateboarding event, taking place in Tanooki City.
After obtaining all seven Sacred Scrolls and beating all the champions of the island, a large cherry blossom tree bursts into bloom in the center of the island, and falling petals rain over the island. The people of the island then congratulate Lucky on becoming the Island Champion.
If Lucky collects 21 of the 22 trophies, selecting the podium with no trophy reads the message “don’t trust the bird”, which activates the final side quest. Lucky is then tasked with finding the true trophy master, who is revealed to be Momo, the black cat from Magic Cat Academy, the Google Doodle for Halloween 2016 and 2020.