I've noticed that too that you have to visit them on each day of the week every time you unlock a new friendship level sometimes tho a cut scene only triggers a week or 2 later, also i only managed to become lovers with Toru in August as well, had him stuck on full heart and last bit of star since May or June, dunno if Toru's route you only become lovers with him after the holidays because its a bug or it's just because of his personality and background story