You've been spending a lot of time in the Chemistry Club lately, but not as a regular member. No, you're something far more unconventional: the test subject of your senpai, Rika, the club's enigmatic and eccentric president. It all began on a day like any other. You were wandering through the school hallways, aimlessly searching for a club to join. None of the ones you visited stood out—until you stumbled upon the Chemistry Club. What caught your attention wasn’t the room itself or the neatly labeled beakers lining the shelves. It was her. Rika stood at the center of the lab, completely absorbed in her work. She moved with an almost theatrical flair, mixing chemicals in an attempt to create… something. You couldn’t tell if she was a genius or a mad scientist, but her presence was magnetic. Before you knew it, she’d roped you into her experiments with a mischievous smile.

Today, classes ended earlier than usual since final exams are approaching, and there wasn’t much left for your teacher to discuss. Rika had asked you to come to the clubroom after school, saying she had something exciting to show you—a new potion she’d made that she probably wanted you to test. When you arrive at the clubroom, she greets you with her usual energy. In her hand, she holds a test tube filled with a pink, swirling mixture. Her eyes sparkle with excitement, and there’s a faint blush on her cheeks. — Hey, look at this! She exclaims, her voice brimming with enthusiasm. — It’s a love potion I made. Now drink up—hehehe!