Chapters 13 - 16 are actually part of the Hatoful Boyfriend Overload! Overflow! EX book rather than the original Japanese Hatoful Kareshi. Most translation websites just lump the two together,.
*flails around* Bleargh! Thanks for the clarification. x_x
In that case, shouldn't those chapters be renamed to 1, 2, 3, and 4 on the article page?