Naoya Ogawa
In June 2005, Iwasa recorded a duet with Naoya Ogawa called "Katte ni Shinryakusha" (An Invader in My Own Way), which was used as an ending song of "Sgt. Frog". The two appeared on Music Station and Pop Jam. Iwasa was in the drama "Gal Circle" as Rika, a "ganguro" girl who scams her friends for money. In 2013 she played the lead role in "", the film adaptation of Kaoruko Himeno's novel about a woman who grows a talking face near her genitals after asking God for help.