www.dotup.org project - 404 File Not found.
Apparently is neither of the points of the list posted 2 weeks ago.
Airs April 24st and has no summary at all.
Edit: One of the kanjis can mean "castle". Although it could have other meanings related to it.
The other two kanjis require reliable translations to discover the meaning.
Edit: The title apparently is Undersea Castle! Skrelp and Dragalge!