Question: Summer Days is an erotic visual novel developed by 0verflow, released on June 23, 2006 for Windows and later ported as a DVD game and for the PlayStation Portable (PSP), It is the second installation of "School Days" line of series, succeeding the visual novel of the same name and preceding "Cross Days", a Japanese erotic visual novel developed by 0verflow, released on which date?
Sentence (from "Summer Days"): Summer Days (サマーデイズ , Samā Deizu ) is an erotic visual novel developed by 0verflow, released on June 23, 2006 for Windows and later ported as a DVD game and for the PlayStation Portable (PSP).
Relevant evidence: No