Kuroshitsuji

Yep. Actually the manga is way better than the anime.

What chapter should i start tho?

Start at ch. 36 It continues from book of circus and eventually leads up to book of Atlantic

Have you watched the movies or just the show ?

Start from Indian Butler arc. Or rather start from beginning. The plot in anime is extremely different from manga. Ash, Angela, Pluto, slutty nun dont exist in the manga. Neither does Alois or Claude.
It goes this way:
*Black Butler Arc (ch 1-5)
*Red Butler Arc (ch 6 onwards)
*Indian Butler Arc (ch 15 onwards) note: there is no Ash, queen is Queen Victoria not some other entity.
*Book of Circus (ch 23 or 24 onwards)
*Book of Murder (ch 38 onwards)
*Book of Atlantic ( ch 52 - 66)
*Public School Arc from then on. You may skip circus, murder and atlantic arc, also black and red butler arc, read tge ending of Indian Butler arc. Basically your wish, i suggest you read from beginning.

I have watched anime, 2 season right?
And book of murder, book of atlantic, book od circus. That's all

Wah, is that so... That will need many time
Thank you(๑•ㅂ•)و✧