Here is a "stamp" campaign promoting the Godzilla head/new Toho Cinemas in the Kabukicho section of Shinjuku. Basically you have to go to several stations along various Tokyo Metro subway lines (Hibiya, Roppongi, Nihon-bashi) and collect the stamps, which can then redeemed for stickers and a chance at prizes. The rabbit character is "Ro-pe", who is the official mascot of TOHO cinemas. The squirrel dressed as Mothra is his "senpai" (tutor/master/trainer....one who holds seniority) named Akira-senpai
And here is a promotional poster with the unvieling/opening date of the Godzilla head atop the new Kabuki-cho TOHO Cinema: