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"あたしって、ほんとバカ" Romaji: Atashi tte, Hontou Baka English: I'm such an idiot
"I'm such an idiot" is an original song by I$COM featuring CUL. This song is I$COM's 31st work.
"I'm such an idiot" is focused around the 2011 anime Mahou Shoujo Madoka Magica, and more specifically the character Sayaka Miki. The lyrics have various references to it, such as "Sayonara, ai suru anata" (Farewell, my dear, who I love) which is talking about Kyosuke, or "Taisetsu na hito mo midori no hito no moto ni" (My dear person left for the green person) which is talking about Hitomi.
One detail that is obviously referencing the anime is Sayaka's Soul Gem on the right hand side, which gradually darkens over the course of the song, when it originally glowed bright.