Sandatsu no Junbi (S03E12)

Thorvaldur, a man claiming to be "Nagi's otaku friend," visits the dorm. He says he's worried about the dorm's security, but Riku and the other members fail to understand his true intentions. Meanwhile, media outlets report that Ryunosuke and popular singer Hanamaki Sumire are madly in love. (Crunchyroll)