Nowa found a puppy named Airi a few years ago, and is now raising him. When Nowa goes into hibernation for the winter, Airi is still a pup. However, when Nowa wakes up from his hibernation, he finds Airi has grown into an adult dog.
Nowa can't stop being with Airi in adult situations. Nowa is conflicted about the stance of what is right and wrong regarding their relationship. Nowa seeks out Kou for advice.
Nowa is unable to think clearly due to him being in rut and starts to cling to Airi. He knows he needs to tell Airi what is happening to him, but tries to keep it a secret.
Nowa and Airi have decided to help out Grandma Mari at the bakery due to her strained back. While the two of them are working, something happens to Nowa's nipples.
Airi works hard carrying out, "Operation: Nipple-Guard". He applies ointment to ease the pain, but it just makes it worse. With Nowa's nipples becoming more and more sensitive each day, will he ever feel better?
Airi's desire to be Nowa's boyfriend gets stronger. He becomes curious as to why Nowa won't turn into Beast form outside anymore. Wanting to help Nowa, he turns to Kou for advice about the past.
Airi decides to carry out his plan to help Nowa with his trauma. He asks Kuro for something to help Nowa. Will Nowa's trauma ever get resolved? Will the two of them be able to move forward in their relationship?