Urusei Yatsura Vol. 10 (manga)

There's never a dull moment on the beach in summer, especially when Ataru and Mendo encounter a beautiful woman looking for her lost child on the bottom of the ocean. Could this be Ryunosuke's missing mother? Later, Ataru and Ten's ongoing battle for dominance creates some serious collateral damage when Lum gets hit point-blank with a projectile rice cooker. Will she ever talk to them again?!