Check out the results below.

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[Single Monthly Ranking]

1. "Bokura no Yuriika" - NMB48 : 6/19 (497,035)
2. "Joy!!" - SMAP : 6/5 (374,385)
3. "Namida no Kotae" - Kanjani8 : 6/12 (274,343)
4. "Come On A My House" - Hey! Say! JUMP : 6/26 (217,803)
5. "OCEAN" - Tohoshinki : 6/12 (154,057)
6. "TONIGHT" - Kim Hyun Joong : 6/5 (120,321)
7. "Flower Song" - EXILE : 6/19 (118,480)
8. "Issen Ichibyou" - EXILE TAKAHIRO : 6/26 (83,666)
9. "Tokonatsu High Touch" - SUPER?GiRLS : 6/12 (82,259)
10. "Sayonara Crawl" - AKB48 : 5/22 (68,991)

(Check out the full ranking here.)
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[Album Monthly Ranking]

1. "B'z The Best XXV 1988-1998" - B'z : 6/12 (508,947)
2. "B'z The Best XXV 1999-2012" - B'z : 6/12 (496,243)
3. "Nanda Collection" - Kyary Pamyu Pamyu : 6/26 (126,074)
4. "iine! (�???`) ?" - GReeeeN : 6/19 (88,718)
5. "Iriguchi no Nai Deguchi" - Momoiro Clover : 6/5 (83,619)
6. "Koi ni Ochirutoki" - INFINITE : 6/5 (75,510)
7. "Summer Ballad Covers" - May J. : 6/19 (74,483)
8. "Boys Meet U" - SHINee : 6/26 (56,215)
9. "Produced by Masaharu Fukuyama 'Galileo+'" - Various Artists : 6/26 (50,290)
10. "Heart Song" - Chris Hart : 6/5 (48,002)

(Check out the full ranking here.)
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Source: Oricon