The Isle of TS Monster Girls (Version 1.3, "Bamboo Shoot" update) is an adult-oriented RPGMaker adventure game
It sounds like you're referring to an update for a specific adult or fantasy visual novel / interactive fiction project — likely one involving monster girls, transformation (TS = transgender or transformation themes), and perhaps a bamboo-themed setting or character ("Bamboo Sho"). The Isle Of TS Monster Girls -v1.3- -Bamboo Sho... UPD
A murmur rippled through the circle. Soryu—whose bamboo hair rustled like reeds—offered her a leaf-wrapped tea. “We make you a simple promise,” she said. “We will teach you to listen to the island. In return, you will give it a story every full moon, for the island is fed by tales.” The Isle of TS Monster Girls (Version 1