Here is the weekly manga sales ranking for April 12th - 18th.

*1, 124,180 *,124,180 Ahiru no Sora vol.27
*2, 119,710 *,349,493 3 Gatsu no Lion vol.4
*3, 113,402 *,113,402 Cross Game vol.17
*4, 111,212 *,111,212 Air Gear vol.28
*5, 110,363 *,110,363 Hayate The Combat Butler! vol.23
*6, 109,258 *,109,258 Hayate The Combat Butler! vol.24
*7, *73,254 *.*73,254 Hayate The Combat Butler! vol.23 & 24 Service Pack
*8, *67,194 *,657,282 Neon Genesis Evangelion vol.12
*9, *65,409 *,302,238 Ouran High School Host Club vol.16
10, *56,063 *,*56,063 The World God Only Knows vol.8

11, *54,095 *,*54,095 Area no Kishi vol.20
12, *51,569 *,641,778 Bleach vol.44
13, *51,007 *,*51,007 Sakura-Hime Kaden vol.4
14, *47,375 *,*47,375 Cross Game vol.17 with an art book
15, *45,199 *,*45,199 Zettai Karen Children vol.21
16, *40,386 *,*40,386 Kimi no Iru Machi vol.9
17, *38,988 *,368,626 Gintama vol.33
18, *38,669 *,*38,669 Shin Kamen Rider Spirits vol.2
19, *37,217 *,*37,217 Gakuen Ouji vol.9
20, *32,848 *,*32,848 Stardust Wink vol.3

21, *32,300 *,169,484 Kaichou wa Maid-sama! vol.9
22, *29,422 *,*29,422 Honey Bitter vol.6
23, *28,019 *,*28,019 Zettai Karen Children vol.21 with a PV DVD
24, *27,862 *,*27,862 Saijou no Meii vol.10
25, *27,348 *,*85,986 Hanma Baki vol.23
26, *26,994 *,*26,994 Baby Steps vol.12
27, *26,142 *,245,796 Thermae Romae vol.1
28, *27,726 2,224,628 One Piece vol.57
29, *24,396 *,*24,396 Hanagata vol.18
30, *22,892 *,*22,892 Inochi vol.4

Source: Oricon Manga Ranking

Weekly Light Novel Ranking for Apr 12 - 18
*1, 21,881 *65,263 Shakugan no Shana vol.20
*2, 20,769 *59,027 Toradora Spin-off! vol.3
*3, 14,680 *60,035 Sword Art Online vol.4
*4, 11,594 125,730 Saiunkoku Monogatari vol.16
*5, 11,270 *11,270 Nibiiro no Sora, Hikari Sasu Ao
*6, 10,676 200,303 Durarara!! vol.1
*7, *8,192 154,935 Durarara!! vol.2

Source: Oricon Novel Ranking