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Mint chewing gum by Lotte.
Posts with this tag reference the gum's "Boutique" commercial, wherein Ikuta Toma's breath magically turns a store clerk into Asahina Mikuru, the store manager into Suzumiya Haruhi, and a trio of stray cats into a group of cat-eared Nagato Yuki.
30 second version transcript:
Clerk 1: "I'm sorry, we're all out."
Customer: "Oh, I see." *sighs*
Clerk 1: *inhales*
*poof*
Mikuru: "What wonderful breath."
Clerk 2: "Hey mister, you're causing trouble! Do you think it's okay to go around turning people into anime characters?"
Customer: "Sorry!"
Clerk 2: *inhales*
*poof*
Haruhi: "Hey, that's really great!"
Customer: *runs outside panting*
Cats: "..."
*poof*
Nagatos: "Nya~n."
Announcer: "Gum designed for fresh breath. Lotte. Acuo."