This is engine oil for cars and not a drink!

Lucky Star

痛油 (Itayu, literally "Painful Oil")

The kanji for "pain" is used to denote anything with anime characters on it, like the famous "itasha" or "Painful Cars". They are literally "painful to look at".

Eco-friendly oil packed with the scent of peaches!

Eco-Friendly Oil

Scented