My Girlfriend's Little Sister Moved In

The setup

With a big competition three weeks away, a gymnast is staying with her sister and her sister's boyfriend for a month of training. The girlfriend works days. The gymnast does her morning stretches in her room and, noticing how the boyfriend looks at her, asks him to help. Episode 1 is that first session, held a little longer than necessary, and it ends with a question he did not expect. Episode 2 turns the room into a judging panel: she shows him her routines, asks him to score her from one to ten, and promises a gentle warm-up first. Then the front door opens.

Why it earns its number

A rare athlete among the open series, with a built-in calendar: a competition countdown keeps everyone on edge and every morning feels like a new round. The sister always one door away adds the thrill, and the gym talk keeps it playful.

Who should collect it: For collectors who like a countdown, a household full of secrets and a heroine who competes to win.