Yamato Nadeshiko (2000)

Jinno Sakurako grew up in a very poor family and is thus determined to marry a rich man so that she will never have to go through poverty ever again, and is named the "gokon queen" in her quest to find her man. Nakahara Osuke is a brilliant academic (Fields prize winner - Nobel Prize equivalent in Mathematics) who gave up his studies to take over his deceased father's fish-shop. They meet through a doctor's "gokon" (group date) and she falls in love with him under the mistaken assumption that he is a very rich man