You've discovered image 3 of 8 hidden images from the Harlem Beat wa Yoake made artwork collection, by Takashima Kazusa.
Hint: Each section (from the menu) has a hidden image somewhere in the internal frame (where the contents of the section are), except releases. Look for a tiny spot. (^_~)
In the shounen-ai and yaoi projects - series section, search around Harlem Beat wa Yoake made. This time look for something bigger than a spot. Hihihi.