Here are the weekly manga and light novels rankings for December 12th - 18th.

ranks/ this week's sales by copies/ cumulative sales/ titles
Manga
*1, 300,585 *,300,585 Detective Conan vol.74
*2, 202,276 *,202,276 Gin no Saji vol.2
*3, 196,406 *,196,406 Fairy Tail vol.30
*4, 194,173 *,480,001 Shingeki no Kyojin vol.6
*5, 192,448 *,192,448 Chihayafuru vol.15
*6, 107,763 *,107,763 Toaru Kagaku no Railgun vol.7
*7, *88,636 *,*88,636 Hajime no Ippo vol.98
*8, *87,730 *,*87,730 Ace of Diamond vol.29
*9, *85,293 *,*85,293 Hayate no Gotoku! vol.31
10, *81,460 *,*81,460 Air Gear vol.34

11, *76,031 *,*76,031 Kami nomi zo Shiru Sekai vol.15
12, *75,394 *,*75,394 Shura no Mon: Dai Ni Mon vol.4
13, *73,655 *,*73,655 L-DK vol.8
14, *64,793 *,*64,793 Hayate no Gotoku! with the movie DVD
15, *53,932 *,491,289 Bleach vol.53
16, *48,212 *,100,834 7Seeds vol.21
17, *47,215 *,105,242 Hapi Mari vol.8
18, *42,712 *,*42,712 Kimi no Iru Machi vol.16
19, *41,938 *,*41,938 Zettai Karen Children vol.28
20, *41,298 *,*42,298 Yamato Nadeshiko Shichi Henge vol.30

21, *34,057 *,*34,057 Gunslinger Girl vol.14
22, *32,754 *,*32,754 Limit vol.6
23, *32,461 *,136,661 Nurarihyon no Mago vol.19
24, *32,305 *,*32,305 Onii-chan no Koto nanka Zenzen Suki Janain Dakara ne!! vol.5
25, *31,075 2,850,112 One Piece vol.64
26, *30,776 *,*30,776 Shura No Mon Iden vol.2
27, *30,438 *,*30,438 Bloody Monday Last Season vol.2
28, *30,233 *,*30,233 Eden no Ori vol.15
29, *29,846 *,130,761 Vampire Knight vol.15
30, *28,113 *,*28,113 Godhand Teru vol.60

Light Novels
*1, 85,272 172,743 Toaru Majutsu no Index: New Testament vol.3
*2, 31,994 *70,675 Mahoka Koko no Rettosei vol.4 Part 2
*3, 28,912 *28,912 Jojo's Bizarre Adventure Over Heaven
*4, 25,275 259,986 Biblia Koshodo no Jikentecho vol.1
*5, 24,858 *52,640 Accel World vol.10
*6, 19,640 158,262 Biblia Koshodo no Jikentecho vol.2
*7, 15,102 *30,273 Sakurasou no Pet na Kanojo vol.6
*8, 13,420 *31,639 Kyoukai Senjou no Horizon vol.4 Part 3
*9, 10,788 *18,381 New Fortune Quest vol.19 Part 2
10, *9,699 *17,709 Baccano! 1711 Whitesmile
11, *9,111 *18,986 Boku to Kanojo no Game Senso vol.2
12, *9,071 *18,331 C³ vol.13

Source: Oricon Comic Rankings