Say "I Love You."

We are introduced to 16-year-old Mei Tachibana, who, after suffering a traumatic experience in making friends, decides to ditch making friends altogether during high school. She catches the attention of Yamato Kurosawa, the most popular boy among the girls in their high school, and wasted no time making friends with her, even giving her his number, despite the refusals, and even accidentally kicking him when she thought Yamato lifted her skirt a bit (it was just his pervy friend Kenji Nakanishi), earning the ire of Yamato's girl followers. She tried putting it at the back of her mind, until, one night, when a stalker followed her on the way home from her part-time job. Deciding to hide in a convenience store, she tried calling home, but no one answers. She calls Yamato, who rushes to the scene despite being at karaoke with friends at that time. Yamato wards the stalker away by pretending to be Mei's boyfriend...