Senpai, Ojama Shimasu!!

After getting drunk at a company party, Fumi is given a ride home by her favorite senior, Shirota, on his back. He invites her back to his room... a fait accompli, huh?! Just as Fumi is daydreaming about something naughty, all she sees is a burning apartment building! What?! Why is my house on fire?! Having lost her place to live, Fumi manages to force her way into Shirota's apartment. However, the extremely strict Shirota not only makes a move on her, but tries to kick her out...

(Source: Hakusensha, translated)