urusei yatsura universe

Ataru moboroshi was just walking to class when the gun falls in his head

"what is it?" ataru says when the gun send to his braint its functions

"So i can finally make girls join my harem"

"Darling! What you have in there and what you mean by harem?"

"I-I have nothing at all" ataru tries to hide the raygun

"give me this now!" Lum said

"NOO!" Ataru tries to hold the weapon but acidentally actvates the gun hitting someone but who?