The development of Summertime Saga isn't linear; you can visit different parts of the city in whatever order you choose and interact with loads of different characters. You can complete up to three events each day before you must go to sleep and rest for the next day.
Slowly improve your protagonist's attributes over time by participating in events. For example, competing in rap battles with your classmates will improve your charisma, and training at the gym with friends will improve your physical attributes.
Like most 'visual novels,' you can start romantic relationships with many different characters in Summertime Saga. It's definitely one of the more interesting aspects of the game, as things can get a little spicy.
Summertime Saga has an entertaining storyline, tons of characters, and great graphics. Become the star of the (sometimes risqué) saga!