Nagasarete Airantō ながされて藍蘭島 - "Misetakute, Atotori" (魅せたくて、跡取り) Episode 9

Rin invites Ikuto to help her with a construction project, hoping to use this opportunity to impress him as well, though she is oblivious to the fact that Ikuto has no trouble recognizing her feminine qualities. During the project, Mikoto who fancies Rin repeatedly tries to hurt Ikuto as he gets closer to Rin. Ikuto gets worked up when Mikoto challenges him to a duel to see who is better at building. The house gets completed quickly with their hard work. Meanwhile, Suzu, having observed the interaction between Rin and Ikuto, is starting to see what it means to fall in love with someone.