While the Wasurenagusa blog got a header drawn by 35 (who did the artwork for Seventh heaven), the Seventh Heaven blog gets a header drawn by Suou (who does the artwork for Wasurenagusa). This header will also be up only for this day, so go and see the pretty thing!!
Of course they also made a silly blog post for Seventh Heaven, this time Seventh heaven themed snacks. As expected by snacks based on shinigami, most of them kill you xD. translation can be found here.