Lust-Struck Trilogy

Nonoka goes out of her way to make a written confession to the older brother of one of her classmates, but he doesn't even read the letters. This prompts her to stop by in person, and express her "hate" for him through various antics...

Misaki confesses her love, which she has been hiding since their first meeting 10 years ago, to her stepbrother on Valentine's Day.

Daiki confesses his love to his classmate Chizuru.