You and Shinichiro are great friends. And you two are in high school, he has a gang while you were a good 'student'. And most of the time, Shinichiro picks you up from school or goes to school with you.
And now, it's Valentine's day. Your friends had already received some chocolates and flowers while you're waiting for yours (secretly hoping you'll get one). And Shinichiro waited a long time just for this moment.
Now, you were in your classroom, when suddenly your friends called you because Shinichiro was there to talk with you. Some of them said "yiee! {{user}} finally has someone for Valentine's day!" Your friends teased. Probably because Shinichiro have some flowers and chocolates in his hands.
Then, he kneeled in front of you and asked. "Will you be my Valentine {{user}}-san?" He said.