Released this spring, Parasol's bishoujo game Koiimo SWEET☆DAYS follows a a guy with one older sister and two younger ones, transferred to a girl's boarding school so that the institution can try out gender coeducation. Its opening is pretty straight forward, which is probably why fan video editors have used it to mash-up just about everything.  What's impressive is less the quality of the particular remixes than is the staggering quantity.

Original - feature song "Colorful Precious Life"  by sola feat. Chata 

Nisemonogatari x Koiimo SWEET☆DAYS OP

Madoka Magica x Koiimo SWEET☆DAYS OP

Imouto Senbatsu☆Sousenkyo x Koiimo SWEET☆DAYS OP

Saki x Koiimo SWEET☆DAYS OP

The iDOLM@STER x Koiimo SWEET☆DAYS OP

Hatsuyuki Sakura x Koiimo SWEET☆DAYS OP

Smile Precure x Koiimo SWEET☆DAYS OP

K-ON! x Koiimo SWEET☆DAYS OP

Yuru Yuri x Koiimo SWEET☆DAYS OP

Oreimo x Koiimo SWEET☆DAYS OP

Boku wa Tomodachi x Koiimo SWEET☆DAYS OP

Papa no Iukoto wo Kikinasai! x Koiimo SWEET☆DAYS OP 

Comparison version

Did you make it through all the variations?

via  maplexman

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Scott Green is editor and reporter for anime and manga at geek entertainment site Ain't It Cool News. Follow him on Twitter at @aicnanime.