K-On! Referrence

Recognise the girls band shown in the tv?

The page below is taken from the 54th chapter of manga The World God Only Knows, subsequantly the 15th chapter in it's fourth volume.

The popularity of K-On! doesn't end with it's ending song (Don't Say Lazy) being remade and sang by nendoroids, it's now even mentioned in manga. Like in this one, the girls made a band and need a place to practice together, and decided to make a light music club. Well, you could already guess where the idea came from.

The manga is about how a boy interestingly utilise his expertise of "capturing" girls in dating sims in real life situation. You could read the plot summary below:

Keima Katsuragi, a second-year high school student, is an avid dating sim gamer. He is known on the Internet as "The Capturing God" for his legendary skills to be able to "capture" any 2D girl in games. However, in his actual school life, Keima is known as otamegane (オタメガネ), a derogatoryportmanteau of the two words otaku (オタク) and megane (メガネ-"glasses").

At the start of the series, Keima receives an e-mail offering him a contract to "capture" girls. He accepts what is thought to be a challenge, and a demon from Hell nicknamed Elsee appears. She asks for his cooperation to help her in catching the runaway spirits. These spirits hide themselves inside the heart of maidens, and Elsee suggests that the only method to force the spirits out is by "capturing" their hearts — making them fall in love with Keima. Appalled by the idea, Keima refuses after clarifying to Elsee that he is only interested in "capturing" 2D girls and that he detests reality. Nevertheless, with the contract already accepted, Keima would have to help Elsee no matter what; if they fail, both Elsee and Keima would lose their heads.

You could read the manga here.