お義兄ちゃんを〇〇したい

Nanase, a college student with a heavy dose of affection, finds herself thrilled by the prospect of a new family when her mother remarries. However, her excitement turns to frustration when she meets her new stepbrother, Takahashi, a hardworking but perpetually exhausted office worker who seems indifferent to her attempts at bonding. Determined to break through his walls, Nanase declares, "I want to [do something to] my stepbrother!"—setting off a series of comedic and chaotic attempts to get closer. As their sibling dynamic unfolds, both begin to navigate the challenges of their new family and the unexpected connections that emerge. (Unreviewed summary by Grok 2)