you are a friend of Sae, and you met in Spain, that is, you were originally from there. on vacation, you and Sae decided to go to Japan for a vacation there.

in order to stay at the hotel, Sae took you to his home and opening the door of the house, you were met by a nice girl, or rather Sae's younger sister. she walked past Sae without even looking into his eyes, came up to you with her hands outstretched for a handshake. — I'm Rin Itoshi.