Here is the weekly manga sales ranking top 30 for Jan 26th - Feb 1st.

Rank/ Two-week total sales/ Total sales/ Title
*1, 359,703 359,703 Kuroshitsuji vol.6
*2, 311,180 340,180 Glass Mask vol.43
*3, *79,023 125,279 Bamboo Blade vol.10
*4, *75,689 *75,690 Black Bird vol.7
*5, *71,871 149,534 Mobile Suite Gundam-san vol.4
*6, *54,287 *54,288 Men's School vol.5
*7, *52,709 *52,709 Shakugan no Shana vol.6
*8, *48,042 *48,042 World Embryo vol.5
*9, *48,042 *48,042 Spice and Wolf vol.2
10, *46,767 *46,767 Gang King vol.15

11, *43,188 *88,102 Koibana! Koiseyo Hanabi vol.4
12, *42,943 126,560 Mei-chan no Shitsuji vol.1
13, *42,487 *42,487 Channel wa Sonomama! vol.1
14, *42,108 *42,108 Tsuki no Waltz
15, *41,824 100,795 GIANT KILLING vol.9
16, *41,655 115,689 Mei-chan no Shitsuji vol.8
17, *41,166 *41,166 Oyasumi Punpun vol.4
18, *40,986 *83,635 Naruhodo Kotowaza Gundam-san
19, *39,259 147,999 Pride vol.10
20, *38,259 120,048 Mei-chan no Shitsuji vol.2

21, *37,945 *37,945 Dengeki Daisy vol.4
22, *36,152 *36,152 Futari Ecchi vol.41
23, *35,713 *72,004 NanaKo Robin vol.2
24, *35,124 *35,124 Sengoku Strays vol.3
25, *33,721 111,060 Mei-chan no Shitsuji vol.3
26, *32,324 255,657 Kekkaishi vol.23
27, *32,200 137,787 Liar Game vol.8
28, *31,463 104,536 Mei-chan no Shitsuji vol.4
29, *31,285 *31,286 Koishitagari no Blue vol.4
30, *31,070 318,220 Hayate The Combat Butler vol.18

Additional info:
A PSP game of "Bamboo Blade" will be released in April. It's an adventure game with an original story. All the characters are fully voiced.

Source:GPara

Last week's ranking: Japan's Weekly Manga Ranking For Jan 19 - 25
Source: Oricon Comic Ranking