Hello Charlotte EP1 (2015) is a story about a memory of long-gone gods and loss of individuality, where your Puppet's new friend goes missing among the static.
It is available for free download as a demo and on itch.io:
https://etherane.itch.io/hello-charlotte-ep1 .
Hello Charlotte EP2 (2016) is a story lamenting the impossibility of universal happiness, and idolization of those out of our reach. As her mind unravels, ink will flow, and blood-red flowers will bloom in the desolate field.
Hello Charlotte: Delirium (2017) is a spin-off minigame made to test some of the RPG Maker features. It's a red herring.
Hello Charlotte EP3 (2018) is the final story in the series, serving as a prologue and an epilogue to the main plot. A prosumer noise machine, a virulent insect, an obscene revelation — and an earnest thank you.