Credits
Translation taken from here
Initial translation and editing: Neyla ~ Kiiroi Senkou
Initial quality check and proofreading: DimensionSlip

I opted to skip the honorifics for this one because "aneue" (姉上) is less commonly known than "onee-san" or "onee-chan." The former is just a more formal and archaic version of the latter.

At any rate, Oscar's idol arc has begun.