When was Weekly Shōnen Jump #2031 published?

Weekly Shōnen Jump #2031 has a cover date of July 6, 2009 (it went on sale earlier, on June 22, 2009), published by Shueisha in Japan.

Which manga series were featured in Weekly Shōnen Jump #2031?

Weekly Shōnen Jump #2031 (cover-dated July 6, 2009) featured One Piece, Naruto, Toriko, among other ongoing serializations.

Chapter 547 of One Piece was published in Weekly Shōnen Jump #2031 (cover-dated July 6, 2009), later collected in Volume 56.

Weekly Shōnen Jump #2031 (July 6, 2009) was published during the Part 6: Summit War Saga of One Piece.

Chapter 452 of Naruto was published in Weekly Shōnen Jump #2031 (cover-dated July 6, 2009), later collected in Volume 48.

On shelves: June 22, 2009 – July 6, 2009

One Piece Ch. 547 (Luffy is the only Straw Hat to appear in the story, the other eight appear on the cover of the magazine only)
Naruto Ch. 452
Toriko Ch. 54
Bakuman. Ch. 42
Beelzebub Ch. 17
Inumarudashii Ch. 42
Bleach Ch. 362
Ultimate Chaser
Katekyō Hitman Reborn! Ch. 246
Medaka Box Ch. 7
Akaboshi: Ibun Suikoden Ch. 6
Kochikame Ch. 1605
Gintama Ch. 265 (Gintoki makes a full appearance on the chapter cover only, though he is referenced numerous times otherwise; the story is a mockery of popularity polls, though this is also the issue the newest popularity poll was revealed, as such there is constant fourth wall breaking in reference to the rankings of the characters appearing in the chapter, most of whom don't actually have a role in the chapter)
Psyren Ch. 75
Nurarihyon no Mago Ch. 63
Sket Dance Ch. 94
Kuroko's Basketball Ch. 26
To Love-Ru Ch. 153
Hoopmen Ch. 16
Pyu to Fuku! Jaguar Ch. 380

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