Otakebi Boy Wao! / Tomodachi wa Tomodachi Nanda!

"Otakebi Boy Wao!/Tomodachi wa Tomodachi Nanda!" (雄叫びボーイ WAO!/友達は友達なんだ!, Otakebi Bōi Wao!/Tomodachi wa Tomodachi Nanda!; War Cry Boy Wao!/A Friend Is a Friend!) is the 22nd single by Berryz Kobo. The single was released on March 3, 2010,^{[2][3][4][5][6]} with the A-side Single V following on March 10. It was released in four editions: a regular edition, containing only the CD, and three limited editions, A, B and C.^[2] Limited editions A and B contained a bonus DVD, while edition C contained a special "Inazuma Eleven" trading card.^[7] All three limited editions included a serial number card, used in a promotional draw.

The single was Berryz' third double A-side single.

"Otakebi Boy Wao!" was used as the 4th ending theme for the Inazuma Eleven anime.^[2][6] and as an ending theme for the Nintendo DS game Inazuma Eleven 3.^[8]

The single sold 25000 copies in its first week and debuted in the Oricon Weekly Singles Chart at number 3, making it their highest-ranking single to date.^[9] It also stayed in the top 10 for a second week, ranking 9th.