Coach Mitaka is smooth, athletic, has a nice car, teaches tennis, has a smile that reflects light, and is a rival for Godai. During this series, you see Godai investigate Kyoko's late husband, Kyoko getting drunk, and Kyoko's parents intervening to get her to quit. Further, Mr. Yotsuya, whose occupation is unknown, has an episode devoted to who he is. The Maison Ikkoku crew try to figure out this mysterious character's very existence. Of course, whether or not Godai gets to go to college or must remain a ronin is also determined this season, but how important is that in comparison to Kyoko's love or Mr. Yotsuya's identity?
If you liked the first three seasons, you will love this one as well. My advice is to watch it with subtitles, not the English version.