Tanaka-kun's Day Episode 5

Tanaka wants to stop by the supermarket, which is quite rare. Ohta offers to help carry the groceries, but Tanaka says he needs help remembering what to buy. Tanaka’s sister asked him to buy something last night, but he has completely forgotten. The two walks around the store, trying to figure it out. “She wouldn’t ask me to buy frozen food, because I won’t get home quick enough.” “She wouldn’t ask me to buy something heavy, because I’d refuse.” They start narrowing down the possibilities, but Tanaka still can’t remember...