Asteroid in Love (Original Japanese Version) Season 1 Episode 8 Winter Diamond

Ino decides to challenge herself by participating in the Earth Science Olympiad. It's her first real step forward as their club president. As their second semester comes to an end, the club celebrates Christmas and New Year's together around a warm hot pot followed by star gazing. Yet as they're excitedly looking up at the winter diamond, Ao suddenly begins to cry. She says everything's all right, but...