Im started watch this series with the drama,after that i read the manga.until latest episode 199 and continue to watch anime from episode 1 until 12.

What i can comment for each series :

Manga - Too much ecchi, dramatic and suspense. Especially part between Kiyoshi and Hana san. Just ridiculous.

Anime - Bad voice acting, storyline alter from original manga with a twist. Not bad, too much gore. Hoping for 2nd season.

Drama - Good actor, Vice president really like a bitch! Gakuto is too fugly. Mr.chairman actor really suits him. Looking forward for next episode.