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Appli de Hentai: Kawaii Osananajimi wo Monster Musume ni Shiyou
アプリでへんたい～かわいい幼馴染をモンスター娘にしよう～
A young man stumbles upon a strange app on his phone that allows him to transform his childhood friend into various monster girls. From lamias and harpies to mermaids and arachne, each transformation leads to a new and intimate encounter. The app opens a door to a world where fantasy becomes reality, and the pair explore their desires in ways they never imagined.
As the transformations become more frequent, the line between the ordinary and the extraordinary blurs. The childhood friend embraces her new forms, each bringing unique sensations and challenges. Together, they navigate the erotic possibilities of the app, deepening their bond through these monstrous experiences. But the app's power comes with its own mysteries, and the couple must decide how far they are willing to go in pursuit of pleasure.