Bossun's little sister shows up at Kaimei High School with a problem only the SKET Dan can solve. What starts as a straightforward request spirals into hilarious chaos when the group realizes her issue is tangled up with her brother's own worries. As the sister struggles to articulate what's really bothering her, Bossun finds himself equally stumped trying to help, caught between being the responsible older sibling and actually understanding what she needs from him. The SKET Dan crew jumps in with their usual blend of sincerity and comedy, turning what could be an awkward family moment into something genuine. Relationships shift and clarify when everyone stops talking past each other. This OVA wraps up lingering threads from the TV series while staying true to what made SKET Dance work: characters who actually care about each other, comedy that lands because the heart underneath is real, and the reminder that sometimes the hardest people to help are the ones closest to you.