Here is the weekly manga sales ranking top 30 for March 9th - 15th.

*1, 615,778 *,615,778 NANA vol.21
*2, 281,882 1,476,027 One Piece vol.53
*3, 158,302 *,158,302 Cross Game vol.14
*4, 156,240 *,156,325 Angel Heart vol.29
*5, *93,144 *,*93,192 Souten no Ken vol.20
*6, *66,219 *,486,506 Pluto vol.7
*7, *62,947 *,291,003 Bakuman vol.2
*8, *58,151 *,*58,151 My Barbaric Girlfriend vol.6
*9, *53,489 *,100,143 Drop vol.6
10, *50,832 *,212,820 Eyeshield 21 vol.34

11, *48,701 *,*96,769 Sengoku Tenshouki vol.4
12, *48,200 *,183,783 JoJo's Bizarre Adventure Part 7: Steel Ball Run vol.17
13, *45,136 *,*45,136 Gente vol.3
14, *41,302 *,*41,302 Vassalord vol.3
15, *41,125 *,*41,125 Sakura-Hime Kaden vol.1
16, *40,641 *,*40,461 Elemental Gelade vol.16
17, *40,261 *,*80,437 Sengoku Gaiden vol.2
18, *36,440 *,*36,440 Midnight Secretary vol.6
19, *33,343 *,*63,220 Shinjuku Swan vol.17
20, *32,960 *,*32,960 Chou yo Hana yo vol.8

21, *32,020 *,*57,844 Ganso! Urayasu Tekkin Kazoku vol.22
22, *31,809 *,*55,553 Saru Lock vol.20
23, *31,382 *,*31,382 Monochrome Factor vol.7
24, *29,776 *,*29,776 Chihayafuru vol.4
25, *29,569 *,*92,048 Otogi Moyou Ayanishiki vol.5
26, *28,932 *,*28,934 Attack!! vol.10
27, *28,835 *,*91.581 La Corda d'Oro vol.12
28, *27,872 *,*47,079 Higanjima vol.26
29, *25,162 *,*48,098 Kenka Shoubai vol.14
30, *23,786 *,182,244 Kyou, Koi wo Hajimemasu vol.5

Additional info:
A new volume of Chibi Maruko-chan will be released on April 15th after 5-year blank.

Source: Natalie

Last week's ranking: Japan's Weekly Manga Ranking For Mar 2 - 8
Source: Oricon Comic Ranking