Ending 4 (music)
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It plays almost at the end of 'Ending 3' (as the Moe's House option is called) with Moe on a cloud somewhere near the Pufftop Palace with the treasure. Unlock it in the Sea Jams by clearing Stage 9-2 (Sea of Sky) after completing the game once.
Plays when Kyorozou is dying. It also plays during the final ending when the deceased Ogura rises into the sky as a spirit. Unlock it in the Sea Jams by purchasing it from Jojiro's Shop for 1500 Pearls.