Here are the weekly manga & light novels rankings for May 21st - 27th.

Ranks/ This week's sales by copies/ Cumulative sales/ Titles
Manga
*1, 165,404 *,165,404 Kuroshitsuji vol.14
*2, 154,105 *,154,105 Kinou Nani Tabeta? vol.6
*3, 151,448 *,151,448 Kyou, Koi wo Hajimemasu vol.15
*4, 128,510 *,917,383 Kimi ni Todoke vol.16
*5, 118,702 *,118,702 Danshi Koukousei no Nichijou vol.6
*6, *99,677 *,*99,667 Hoozuki no Reitetsu vol.5
*7, *91,927 *,*91,927 Billy Bat vol.9
*8, *79,782 2,901,059 One Piece vol.66
*9, *69,210 *,*69,210 Yondemasu yo, Azazel-san. vol.8
10, *66,976 *,*66,976 Watashi ga Motenai no wa Dou Kangaetemo Omaera ga Warui! vol.2

11, *62,181 *,176,289 Ace of Diamond vol.31
12, *59,292 *,209,199 Mahou Sensei Negima! vol.38
13, *54,607 *,*54,607 Mei-chan no Shitsuji vol.18
14, *53,810 *,*53,810 Switch Girl!! vol.19
15, *51,855 *,124,089 Kingdom vol.26
16, *51,215 *,*51,215 Namida Usagi - Seifuku no Kataomoi vol.10
17, *50,579 *,*50,579 Bokutachi wa Shitte Shimatta vol.14
18, *48,196 *,*48,196 Neon Genesis Evangelion: Ikari Shinji Ikusei Keikaku vol.13
19, *41,662 *,*41,662 Blade of the Immortal vol.29
20, *39,965 *,*39,965 Shacho Shima Kosaku vol.12

21, *38,960 *,*38,960 Hidan no Aria vol.6
22, *36,443 *,*72,159 Hayate no Gotoku! vol.32
23, *36,011 *,*36,011 Hidan no Aria AA vol.4
24, *35,572 *,*72,768 Rozen Maiden vol.7
25, *34,491 *,147,689 Hayate no Gotoku! vol.32 & vol.0
26, *34,395 1,079,979 Naruto vol.60
27, *34,140 *,241,830 Otoyomegatari vol.4
28, *32,977 *,270,216 Gantz vol.34
29, *31,546 *,*92,388 Capeta vol.28
30, *30,294 *,*30,294 Fullmetal Alchemist vol.14 Complete Edition

31, *29,207 *,*29,207 Danshi Koukousei no Nichijou Anthology
32, *28,943 *,*44,455 Sora to Hará
33, *27,132 *,*27,132 Judge vol.5
34, *24,194 *,*24,194 Yondemasu yo, Azazel-san. vol.8 with OVA
35, *23,826 *,*53,349 Gekkou Jourei vol.18

Light Novels
*1, 64,344 *64,344 Hidan no Aria vol.12
*2, 30,529 *30,529 Seireitsukai no Blade Dance vol.7
*3, 29,787 *29,787 Papa no Iukoto wo Kikinasai! vol.10
*4, 27,647 *27,647 Onii-chan Dakedo Ai Sae Areba Kankeinai yo ne vol.6
*5, 20,375 *20,375 Tsukitsuki! vol.7
*6, 20,143 *34,954 Kore wa Zombie Desu ka? vol.10
*7, 17,008 *17,008 Campione! vol.12
*8, 16,364 *16,364 Shurabara! vol.5
*9, 15,805 *28,535 Seitokai no Ichizon Fanbook
10, 14,998 100,212 Durarara!! vol.11
11, 13,133 162,852 Kotenbu Series vol.1 Hyouka
12, 12,806 *12,806 Ore to Ichino no Game Dokokai Katsudo Nisshi vol.8
13, 11,663 *11,663 Kenshin no Succeed
14, 11,058 *93,522 Kotenbu Series vol.2
15, 10,481 *20,387 Tokyo Ravens vol.7
16, *8,383 *79,226 Kotenbu Series vol.3
18, *8,186 *14,905 RPG World vol.11
19, *7,945 *98,961 Kotenbu Series vol.4
20, *7,698 763,239 Biblia Koshoten no Jikentecho vol.1

Source: Oricon Youtaiju