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You should be able to click the APK in your device and it should ask 'Install?' and it installs it. However, it may just be that the app needs an update! I will take a look at patching and adding a newer version just in case. I should be able to patch it tonight. I'll update here once I've had a chance to take a look, thanks for letting me know!
I updated the original software engine and patched a new version of Telvoikai that is playable -hopefully- on newer and more devices. Let me know if you still have issues! Also... just since you enjoy the story I thought I'd mention I am actually in the progress of making a VN game for the story. Hopefully coming soon and thank you so much for playing <3