After 8 months of continuous updates, the game was released as an official version.
Unfortunately, Steam Workshop cannot be supported with my coding skills and the game has not reached the condition of opening the Steam Points Store. Other than that the all game plan content was achieved.
Please be assured that the bonus CGs will still be updated to the game once the sales target is reached. ^_^
I will still continue to make games of "Etaine" series after this, so stay tuned!