Great question — answering as the UphillTech team:
Season 1: Volumes 1 and 2 Season 2: Volumes 3 and 4 Season 3 episodes 1-9: Volumes 5,6 and 7 Season 3 episodes 10-12: Original Ovas and Specials: Half of volume 8 and original The most likely future: Season 4: Volumes 9 and 10. The way these 2 volumes work it should be this way I watched the anime and read the light novels. About your second question yes, it was very well adapted. Season 3 was a mess though so I'd advise you to read it. Just for Koneko it's worth it. It's nice having her fall for Issei and enter mating season. Koneko in the heat is the best Koneko :)
Full answer by Sanji: https://anime.stackexchange.com/a/38302 (CC BY-SA 3.0).
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