Ipinagdiriwang ni Ono Rikka ang kanyang ika-5 anibersaryo mula noong kanyang debut! Isang malaking commemorative project kasama ang pinakacute na Rikka-tan at 31 iba't ibang cosplay costume na tatangkilikin araw-araw! Sailor suit, fighting game costume, bloomer gym clothes, bunny swimsuit na may bunny ears, Chinese dresses, western costumes, school swimsuits, doctor's white coats, idol costume, bunny costumes, shrine maiden costume, cheerleaders, massage girls, office ladies, black cats, bunny maids, race queen, yukkatars, miniinvestigas sportswear, beautician, tutor, erotic costume streamer, SM girls, basketball uniform, pagkaalipin, seksing katulong, blazer uniform, puting pusa! ! Aling Ricca doll ang paborito mo? ?