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Starfy and Moe meet Wotsaruto in Deep Sea (Stage 5). Wotsaruto and Moe both tell Starfy that Wotaruto's Tone of Ocean has been stolen. A flashback plays where Wotsaruto shows Moe the Tone of Ocean only to have it stolen by Blantern and two Buranko after the stage turns dark. The Tone of Ocean is then hidden in a large side-scrolling room with arrow buttons which change the direction that the screen is scrolling when Starfy uses Star Spin on them, depending on the direction that the arrows are facing. After locating the missing Tone of Ocean instrument, Wotsaruto badly plays the song of the same name. This shocks Starfy and Moe, but it also frightens off a pair of Nogo that were blocking Starfy and Moe's path.
Wotsaruto also appears in the background of the sound test after completion of the main game. Selecting any option on the sound test will show Wotsaruto playing the Tone of Ocean.
Starfy and Moe meet Wotsaruto again in Pitch Dark Cave (Stage 6-1), where Wotsaruto talks to Moe. Wotsaruto has a flashback, where the ground shakes and Puchi Ogura #6, wearing a Kigurumi appears and threatens Wotsaruto, making them flee. Later, in the present, the ground shakes and Puchi Ogura #6 wearing the Kigurumi appears in person. He then runs off and kidnaps Wotsaruto.
Starfy and Moe later catch up with Puchi Ogura #6. Puchi Ogura #6 talks to Wotsaruto for a short while, before grabbing Wotsaruto and walking off with them. After catching up with Kigurumi again, Moe intervenes and challenges Kigurumi. Moe shouts something very loudly, causing the area to shake itself and rocks to fall from the ceiling. This frightens not only Kigurumi, but also Starfy and Wotsaruto to the extent that Puchi Ogura #6 drops the Kigurumi and reveals himself to Moe, Starfy and Wotsaruto and flees, revealing a Key which opens several keyholes around the area, one of which leads to the treasure chest containing the Kombu Mawashi at the end of the Stage 6-1.
After defeating Ogura for the first time, a sound test option is available in Moe's House. When music is played, Wotsaruto appears to be playing it with the Tone of Ocean, and Moe appears to be singing the song.
Wotsaruto playing the Tone of Ocean in Densetsu no Starfy 3.
Starfy, Starly and Moe meet Wotsaruto in Gabun Ocean Trench (Stage 7-3) where he is playing the Tone of Ocean. He claims that a lullaby from the Tone of Ocean is able to put someone to sleep but it doesn't work on putting Gabun to sleep, shocking Wotsaruto.
Starly suggests one would be tired to hear the same song over and over again. Wotsaruto suggests that he, Starfy, Starly and Moe should form a "Legendary Band" (Japanese: でんせつのバンド) in which legendary instruments (Japanese: でんせつのがっき) are to be played, so Wotsaruto leaves them to locate three legendary instruments. They find the Legendary Guitar, the Legendary Bass and the Legendary Drums and form a rock band. Wotsaruto wants to use a guitar they recently bought but Starfy is already using the Legendary Guitar, so Wotsaruto gives the guitar to Starfy as an accessory. Starly apparently doesn't like Wotsaruto's Tone of Ocean, so Moe turns it into a saxophone called the Ocean Saxophone, which Wotsaruto uses in the band. When they rock out, Gabun enjoys the music a lot and it causes him to fall asleep.
Wotsaruto does not appear in the story. However, he can seen in the level selection screen of Degil's Castle. Tapping them will give the player five Pearls.
Although Wotsaruto doesn't appear in the story, he can be seen among an audience in the cover of the sixth chapter of volume 2, "I Want to Appear in the Movies Too Fii!".
Trivia
Wotsaruto's name is a reference to the famous composer and musician, Wolfgang Amadeus Mozart.
Wotsaruto's Tone of Ocean is legendary like Starfy.
