Dr. Slump Vol. 11 (manga)

In yet another naughty volume of Dr. Slump, Senbei and old man Tsun Tsuru-Ten head to the local public bathhouse sporting X-ray specs, not realizing that everyone there is already naked. And when Senbei is forced to explain Arale's existence to his grandfather, he pretends she was a free toy in a box of caramels…