It turns out that this one was as odd as it sounds.
Along with 7DAYS t-shirts featuring the girls and their favorite activities, there are “memories of flesh” postcards, books of replica anime cels/production stage limited MON mono-eye caps (only 115 being made) and the pièce de résistance, a Sakiccho-dake Shippo Dakimakura/Just-the-Tip Tail Pillow (7,000yen).