The Devil Is a Part-Timer!, Vol. 10 (manga)

"Repairs to Devil's Castle, Maou's one-bedroom apartment in Japan, are complete--and now it's outfitted with an all-new HD socket. The Devil King's never owned a TV before, so once he's armed himself with all the knowledge he needs, he's off to the electronics outlet. With Lucifer the only one home, what will happen when a certain angel makes an unexpected visit?"--Amazon.com.