Ore no Imouto ga Konnani Kawaii Wake ga Nai (OreImo)

Information:

MAL: View Ore no Imouto ga Konnani Kawaii Wake ga Nai @ My Anime List
Genres: Comedy, Seinen, Slice of Life (Added romance eventually)
Episodes: 12 (32 Episode - Full Series)
Premiered: Fall 2010
Rating: PG-13 - Teens 13 or older
Romance amount: Moderate
Romance quality: High
Drama: Moderate
Fanservice amount: Low
Harem: No (Kinda went harem after season 1)

General:

The Couple:

Happy Ending:

Yes

Conclusive Ending:

Yes

Conflict:

Love Triangle:

Yes

Love Rival:

Yes

Cheating:

Yes, Kinda

Romance:

Kiss:

Yes

Do they admit their feelings?

Yes

Do they end up as a couple?

Yes

Romantic closure:

Yes

Important Notes:

WATCH ORDER
1. OreImo Season 1
2. OreImo Special (Canon)
3. OreImo. Season 2
4. OreImo. Special (Canon)

There's also 2 endings in season one I suggest watch "Good End" then "True Route" after. (or you could skip "Good End")