This TV ad has been seen many times recently. The song is sung by Kana Nishino who is one of the most famous singers in Japan. The woman talking about the product is Haruka Ayase who is a very popular actress in Japan.
The ad is about a detergent. Sometimes it gives clothing a strong scent after washing, but the product does not. Just enough for somebody important, within a 30 cm radius. It does not annoy other people around you.