So they managed to live together, but one to a trade school, the other a University. Maybe Japan has so many schools that there is always one for every city block...especially neither of them drive.
Japanese apartments are advertised with how many minutes walk they are from a train station.
By one survey, only 27% of trips in Tokyo are by private car. https://www.sc-abeam.com/and_mobility/en/article/20201203-01/ And those probably are biased toward the outer edges, families, or workers who regularly need to carry stuff.
If something is set in a Japanese city and they're not explicitly shown driving, you can assume they're getting around by foot, bike, or public transit.