A cat promises a grieving kid he'll help her meet her dead dog at the end of the rainbow, and somehow that works. Jin's plan is ridiculous and small and completely sincere, and it matters more than any grand gesture because it comes from something real. This is five minutes that remember what it feels like to lose something you loved, and refuses to make that small.
A grieving boy named Mugi struggles to accept the death of his beloved dog Shiro. When Jin, a neighborhood cat who cares deeply for the boy, learns about Mugi's pain, he makes an extraordinary promise: to help him reach the Rainbow Bridge, that mythical place where departed pets wait. Armed with nothing but determination and a story his owner once shared, Jin rallies an unlikely team of local animals to execute his plan. Pigeons scout from above while squirrels scurry below, each creature contributing to the mission in their own way. What unfolds is a gentle, heartfelt journey about friendship, loss, and the bonds we share with our pets. The story balances warmth with melancholy as Jin proves that love transcends species and that sometimes the smallest gestures carry the greatest meaning. This one-episode ONA captures something tender and true about saying goodbye, offering both comfort and hope to anyone who has ever lost a cherished companion.