長瀬 湊

She is Jun`ichi's younger sister.
She is a year younger than he is and attends the same school that he does as a first year high school student. She is capable in all areas of household related work and is proud of it. She also has unique abilities, like listening to the ground to detect the presence of animals, as well as be able to communicate with them. She has feelings for Jun'ichi. She mentions that she was an adopted sister once, but later says it was a joke. Minato is blood-related to Jun'ichi in the PC game, in the PS2 version she is not related to him, and it is implied that she is not blood-related to Jun'ichi in the anime.
She's a friend of Yocchan. In Hoshizora e Kakaru Hashi she visits Yamabiko with her.