The fifth film is an animated adaptation of the final story of the manga and is also the official ending of the anime series, in which Lum and Ataru must repeat the game of tag played out in the first episode of the television series, or the Earth will be infested with mushrooms larger than buildings. Further, should Ataru lose, Lum will leave forever and everyone's memories will be changed so that they don't remember she, or her friends, were ever there. Finally, Lum refuses to allow Ataru to win unless he says to her those three words "I love you," that he has steadfastly refused to say over the entire series.
An ordinary high school boy fails to get into any private academy except one — which happens to be populated by supernatural creatures disguised as humans. To survive, he has to pretend that he is one of them and blend in.
When Sophie, a shy young woman, is cursed with an old body by a spiteful witch, her only chance of breaking the spell lies with a self-indulgent yet insecure young wizard and his companions in his legged, walking home.
First-grader Masaya is a crybaby despite his large stature, so he can't walk by himself on the dark path to school. The one who holds his hand is Akiyo, a tiny but capable second-grader. Masaya wants to be strong like Akiyo and admires her, but one day, something happens that leaves Akiyo in tears. To lift Akiyo's spirits, Masaya goes trekking to the distant Ipponsugi forest to find the spotted bellflowers that Akiyo loves.
Holmes, a young man whose family runs an antique shop in Kyoto, has the unique ability to read people and instantly distinguish genuine and high value antiques. When a local high school student, Aoi Maki, starts working alongside Holmes, together they begin to unravel the many mysteries surrounding the antiques brought to the shop.