A cartoonist teenager who is running out of inspiration on his creative journey inadvertently adopts two pets when he goes out in search of inspiration. The cat is named Emperor and the dog is named Bazaar Black. Although the two little guys often caused him a lot of trouble, they also gained two pieces of companionship and love. Although they are a cat and a dog, the teenager knows that they are family. And so, the teenager's noisy but warm and happy life began.

Two martial artists are brutally killed by a team of assassins, leaving their wards, a young boy and girl, defenseless. A martial arts master dispatches of the assassins, sparing their lives, and decides to take them in. He raises them and teaches them martial arts.

The OVA will be based on the Narumi Seo character map story event that was featured in the smartphone game in April 2018. Seo, who has a unique memory disorder, will appear alongside other heroes of the Seo Research Laboratory in the OVA.