Natsuki Shinohara is one of the main characters in the anime film 'Summer Wars.' She is a bright, energetic high school student who invites her classmate Kenji Koiso to her family's home for her great-grandmother's birthday, inadvertently involving him in a crisis that threatens both the virtual and real worlds. Natsuki is cheerful, caring, and determined, playing a central role in uniting her family and friends as they collaborate to overcome the challenges posed by the rogue AI, Love Machine.