instance_of da pump
" 1 " ( read " Infinity Ichi "; translated as " Infinity 1 ") is Do As Infinity ' s twenty - first ___MASK84___ , released on June 17 , 2009 . The ___MASK5___ had disbanded in September 2005 , but reformed three years later in September 2008 . This is the first new ___MASK84___ the ___MASK5___ released after reforming , and is the first ___MASK84___ by the ___MASK5___ not to have Dai Nagao . The ___MASK84___ contains four songs , though none are named " 1 ", and this is the first Do As Infinity ___MASK84___ not to contain instrumental versions of any song . A music video directed by Kensuke Kawamura was produced for " Umareyuku Monotachi e ". Da ___MASK18___ (  Da Panpu ) is a Japanese male idol group comprising lead vocalist , Issa Hentona and MCs Ken Okumoto , Yukinari Tamaki , and Shinobu Miyara . The group formed as students at Okinawa Actors School in 1996 . They made their debut on Avex Trax subsidiary , avex tune , under the guidance of producer Akio Togashi on June 11 , 1997 with `` Feelin ' Good - It ' s Paradise '' . As one of the few male groups unassociated with Johnny ' s ___MASK97___ , they were the first to gain major popularity reaching their peak in 2001 with the release of Da Best of Da ___MASK18___ . On April 7 , 2006 , Shinobu formally left the group following a hiatus due to a drunk driving incident in 2005 . The group went on an unofficial hiatus at the end of 2006 . On December 18 , 2008 , it was announced that Yukinari was leaving the group and that Ken and Issa were actively looking for his replacement . Within hours , their management ___MASK86___ announced a ___MASK80___ new Da ___MASK18___ with seven new members and a new concept as a multimedia entertainment group . The group will start their official comeback on July 15 , 2009 with the new single , `` Summer Rider '' and a tour in the fall . It was announced on December 5 , 2009 that Ken Okumoto has left Da ___MASK18___ to pursue a solo career , leaving Issa the only original member left . " Summer Rider " is Da ___MASK18___ ' s 26th ___MASK84___ on the avex tune label . It is the group ' s first ___MASK84___ in three years and their first as a nine - member unit . It was released on July 15 , 2009 , in two formats , CD and CD + DVD . The ___MASK84___ will contain three original songs including the title track , a dancable summer tune , and their instrumentals . It will be used as the commercial song for Youfuku no Aoyama ' s Seiryou Suits campaign starting on ___MASK21___ 25 . First pressings of the CD + DVD version will come with a bonus movie . A listing on Amazon Japan , states that the still untitled second track on the ___MASK84___ will be produced by Infinity 16 .