According to poll conducted at Biglobe website, fans were asked on what anime series that made them cry and drama with romance drama anime Ano Hana topping the survey.

Ano Hana ranked first with 1,057 votes while Clannad After Story and Angel Beats in second and third, respectively. Not far from fourth place is slice of life comedy series, K-ON!

Rankings

1. Ano Hana
2. Clannad After Story
3. Angel Beats!
4. K-ON!!
5. Toradora!
6. Puella Magi Madoka Magica
7. Clannad
8. Code Geass 2
9. One Piece
10. Crayon Shin-chan: The Storm Called: The Battle of the Warring States
11. Natsume’s Book of Friends
12. Air
13. Fullmetal Alchemist
14. Fruits Basket
15. Guilty Crown
16. Mahou Shoujo Lyrical Nanoha A’s
17. Gurren Lagann
18. Ano Natsu de Matteru
19. Mahou Shoujo Lyrical Nanoha
20. Pokémon

Poll was conducted between May 16-23 with a total of 7,836 respondents voted.

Ano Hi Mita Hana no Namae o Bokutachi wa Mada Shiranai tells a story of six childhood friends that have become estranged after a tragic accident. Now in their high school years, a sudden surprise forces each of them to confront their guilt over what happened that day and come to terms with the ghosts of their past.

[Source]