The original novel and manga adaptation focus on letters sent from deceased dogs to their former owners. The anime adaptation stars P-chan, a dog whose owner abandoned him. (Source: LiveChart)

About to enter junior high school, Karada Iokawa is a cheerful and reliable girl, who hates being treated as a child more than anything. After her parents' deaths, her older brother, Hiro, comes back from studying abroad to take care of her. His ex-girlfriend Shouko Nogami, a composed yet sometimes childish and stubborn young woman, follows him to Japan in order to find out why he left her. Between the two girls, the atmosphere is tense, which eventually leads to Shouko calling Karada childish. Later, Karada stands before a shrine praying to grow up. Little does she know that the shrine wishing stone would grant her wish. As Karada grows older, at the same time, Shouko, who happens to be nearby, finds herself a child once again. With their ages now reversed, Shouko and Karada must come to terms with one another and ultimately themselves.

It has been six months since the tragic accident in Joe and Rikiishi's fight. Joe believes he has overcomed Rikiishi's death and decides to make a comeback. Joe does make a successful comeback by scoring 5 KO's by body blows. Joe is then given a shot at the national title as a means by the boxing commission to put him down. The champion, Tiger Ozaki makes use of Joe's habits and ends up making Joe's corner throw in the towel. Joe is afraid to throw punches at the face because of what happened to Rikiishi. Youko, Joe's love interest and the owner of the gym where Rikiishi trained at recruits a world ranked boxer from Venezuela, Carlos Rivera, to get Joe back on his feet and pursue his boxing career to the regional and world ranks. (Source: ANN)

The fourth and final recap film of Attack No.1. Now set in high school the team competes at inter-high but tragedy strikes.