*POSSIBLES SPOILERS*
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They are all the protagonists of my previous visual novels.
Koko and Seiichi are the main characters of "Koko" (the first game) and "Reiko" (the second game). Rebeca and Daniel are the main characters of "Dear Rebeca".
And this easter egg or secret route is a continuation of both Rebeca and Reiko's ending.
When you start a new game, and you type the name Daniel, there is a slight interaction. Also, when writing the name of the doll Rivká, if you name her with some names from my previous games, there is 1 small reference to them.