Otakebi Boy WAO! / Tomodachi wa Tomodachi Nanda! (雄叫びボーイ WAO!/友達は友達なんだ!; War Cry Boy WAO! / A Friend Is a Friend!) is the 22nd single by Berryz Koubou. It was released on March 3, 2010. "Otakebi Boy WAO!" is used as the fourth ending theme song for the anime Inazuma Eleven. This double A-side single was released in limited A, limited B, limited C, and regular editions; limited A and B coming with bonus DVDs and limited C and the first press of the regular coming with an Inazuma Eleven trading card. All limited editions and the first press of the regular edition come with a serial number card used to enter a lottery where tickets can be won to an event. The single reached #3 on the Oricon charts and charted for seven weeks, selling 35,002 copies.