Ken is a super fan of the the idol group Planet – or to be precise, a hardcore idol otaku. One day, while pre-ordering the latest idol goods, he notices the salesperson to be a really flashy guy. But that guy turns out to be a student at the school where Ken works! "Please keep quiet about my hobbies," begs the desperate Ken, and his devilish student agrees, but on one condition: "From today on, be my dog."