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Amakute Hoshikute Torokeru Chuu started out as a web novel on Fuguriya's website before being adapted into the seventh game of the Sono Hanabira Ni Kuchizuke Wo series.
With Strings Attached. Half of it is online; the second half is only available in the print/electronic editions. The first chapter of the sequel, The Keys Stand Alone, is also online; the author hasn't decided whether to put more up yet.