In Another World With My Smartphone

(Warning: orodha contains Strong violence and Nudity.... But, this is the anime club, and anime always has that, so wewe guys are okay with that)
You get the picture, lets start.... But, first, rules. Only one anime from a whole series, including its spin-offs, I do not have to watch the anime to include the opening, and my opinion on the opening does not reflect my opinion on the anime itself. I could utterly despise the anime but like the opening. Okay, then, lets start.

50: OP from Panty and stocking, pantyhose with Garterbelt
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49: Sora Mimi Cake from Azumanga Daioh
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48: Shooting nyota from Onegai Teacher...