I didn't find it to grind on my second playtrough for the 0.3b once i learned how to optimize your time and money, like, take your Stamina to 3 as soon as you can, put one time slot everyday to working for Xavier, use the money to buy gifts at the mall, form a party with the girl to attend classes and go sunbathing with them on the evenings for the Trust farming, meanwhile you can get around 30 Love per day with sexy times during the night, with Stamina 3 you can handle all of them once per day. Also the story events. In other words... Improvise, Adapt, Overcome.
As a nice bonus the gifts sometimes have some pretty sweet interactions when giving them, like the box of chocolates to Laura, goddam the smol murder machine must be protected at all costs.