Yuuna and the Haunted Hot Springs Vol. 5 (manga)

NEW STUDENTS, SAME TROUBLE!
Oboro's always had an eye for Kogarashi, and she's dialing up her seduction to eleven: She'll try everything from dressing up as an idol singer to crashing his school for some hardcore flirtation! She's not the only new student, either. A certain familiar lady ninja is about to get added to the rolls! It's a whirlwind of new developments at the Yuragi-sou inn, involving everything from Halloween costumes to giant flying cats. It's tough work being the only guy at a boarding house full of paranormal beauties!