There's No Freaking Way I'll be Your Lover! Unless... (Manga) Vol. 6 by Musshu

Sparks are flying in more ways than one on Renako and Ajisai's runaway vacation. An unexpected conflict brings the two closer than ever before, but is it the bond of friendship that's growing between them, or something more.? Before they can pin down their true feelings, though, a certain friend with Renafits crashes the party! This summer will certainly be one to remember!
Binding: Paperback / softback