I would submit that this seeming windfall is NOT the onset of more Level manga streeting per week. If we revisit previous release schedules, the four extra titles—volume 2 of Level's #3-ranked bestselling manga Love and Collage; volume 12 of the #16-ranked Negima!; the series premiere of Team Medical Dragon; and the third tankō of the #8-ranked xxxHOLiC—were actually scheduled to come out sometime May 2008. So it's probably more a case of Level playing catch up.
Toggle the release links to see details and cover scans
- Fight!! Ippo (Hajime no Ippo) 48 of 84+ by Morikawa Joji
- If You Were Here (Anata ga Ireba) 5 of 8 by Yoshimura Akemi
- Love and Collage (Ai Kora) 2 of 12 by Inoue Kazurou
- Magister Negi Magi (Mahou Sensei Negima!) 12 of 22+ by Akamatsu Ken
- [Premiere] Team Medical Dragon (Iryū -Team Medical Dragon-) 1 of 17+ by Nogizaka Taro & Nagai Akira
- Vagabond 22 of 28+ by Inoue Takehiko
- When You Wish Upon A Star (Hoshi no Furu Machi) 2 of 7+ by Hara Hidenori
- xxxHOLiC 3 of 13+ by CLAMP
Source: Elex Media STO 25 Juni 2008; all manga priced IDR 16,000 except for xxxHOLiC 3 which carries an IDR 17,000 price tag
Since there's only one new series debut (much awaited though it is), let's get right to the breakdowns (of the non-nervous variety).
Seinen leads shōnen by one title, and despite there being only one shōjo (If You Were Here or Anata ga Ireba), the Get pledges of this Yoshimura Akemi-sensei title gave CLAMP's xxxHOLiC decent competition. I say this because I did a quick count over at the EMO thread.
By original publisher
It's a tie between Shogakukan and Kodansha. I wouldn't have noted this down except it's usually one or the other. This 4-4 draw, I believe, is the first time that both publishers are sharing the same crown (must be crowded under there).