Invincible Friendship is the sixth episode of Fruits Basket.
Tohru finally tells her two closet friends, Arisa and Saki, that she is living at the Sohma house. They both insist that they visit and stay the night to ensure that Tohru is being treated right and that Tohru isn't living in a poor environment.
A Rice Ball in a Fruits Basket
A Plum on the Back