Frog TF in I'm Gonna be an Angel! / Tenshi ni Narumon

It's an oldie, but I haven't seen it mentioned here, so just in case; episode 9 of the anime I'm Gonna be an Angel!, or Tenshi ni Narumon! if you prefer, has a bunch of frog TFs of both genders.

Long story short, the villain of the week is a weird-ass monster whose ukulele can turn people into frogs; thanks to his power, many characters of both genders are TFed, until protagonist Yuusuke finds out how to defeat him and return everyone to normal.

As far as the process goes, the characters glow, then their empty clothes fall to the ground, then we see them as adorable frogs. Pretty simplistic, but cute and effective. Only the first TF doesn't have such process, since the girl was taking a shower at that time. I'm sorry I couldn't get screenshots of the process itself, but the episode is pretty easy to find by Googling its Japanese name.