(ๅใซใใฌใปใใฌใใงใใ็็ฑโค โ The Reason I Got a Harem of Casual Sex Friends 5 )
This is the 5th volume (or chapter/installment) in a series that falls under the genre, typically involving a male protagonist who ends up with multiple casual sexual partners ("sefure" = ใปใใฌ, short for "sex friend"). boku ni harem sefure ga dekita riyuu 5