Emerald Mountain Yeah!

Futakoi Alternative · Episode 3 · “Emerald Mountain Yeah!”

The Futaba Detective Agency, being run by Rentarou, who has taken over the family business, after his father's death 3 weeks ago. Along with Sara & Souju, his live-in identical twin assistants, he ends up running afoul of the local Yakuza. (Source: Anime News Network)