That Wolf-Boy Is Mine! Omnibus 2 (Vol. 3-4) by Yoko Nogiri

After Rin shares some profound insights with Komugi about her crush, she learns it's easier to bottle up her feelings for the wolf-boy, Yu. As Komugi gets to really know Rin the fox, his cold exterior slowly melts away - and Yu can't help but be concerned. In order to let someone new into his heart, Yu struggles to confront his emotional trauma from the past. But by the time Yu realizes his true emotions, something unthinkable has happened to Komugi... The second of two volumes, this omnibus collects volumes 3 and 4 of the original serialization.
Binding: Paperback / softback