Boys' Love Novels Give your dog a chain. Chocolate paperback

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Shingo Inaba, a childhood friend of Azusa Ishihara, who is an up-and-coming painter who is not good at interacting with people, and who has been attached to him like a puppy since he was a child, and has followed him since he was six years younger.
Even now that he has become a university student with a big figure, he still calls him "Azusa chan" and takes care of him. Azusa, who complained that a cute puppy became a big dog, but one day he was surprised to see Shingo with his university friends.
There was Shingo, who was the face of 『 Otoko 』, who he didn't know.