Well, as a guy who have played both the first and second series of Tsuyokiss, I feel rather disappointed with the anime. Sunao Konoe is the least character that I like, and they made her the main heroine....
Because of that they lack Character Development from the "original" main characters. Sunao Konoe was not included in the game, she was added in the Omake Fandisc and Tsuyokiss 2 replacing the teacher.
Well, overall the anime was funny and a lot of fanservices is given out, and there are cameo characters from "Ane Chanto shiyou yo!" since the company was the same, Candy Soft.
Conclusion is, if you want a break from serious stuffs watch Tsuyokiss.
:D