Lily to Kaeru to (Otouto)

Lily’s family trip to the Frog-themed amusement park takes an unexpected turn when she discovers a sword within the park's castle. Legend dictates that defeating a colossal serpent with this blade grants a wish, leading her to the fantastical realm of Frog Land and its enigmatic ruler, the Frog King. However, her newfound status comes with a condition: she must unlock the Gate of Hope before a creature hatches from a mysterious roe. This responsibility is complicated by the arrival of Knodo, a man who insists he is destined to be her younger brother, setting off a chain of events that plunges Lily into a confusing and uncertain situation. The series explores themes of destiny, freedom, and the unsettling nature of predetermined roles, all within a vibrant and whimsical world.