Volume 1 
Keitaro Urashima is the only boy living at the Hinata House, an all-girl dorm. Despite the fact that he's kind of a screw-up, the girls are climbing all over each other in an effort to tear his clothes off. But it's not what he thinks! Supposedly somewhere on his body is a map to Hinata's secret treasure! 
Volume 2 
When a crazy robot that looks exactly like Keitaro appears out of the blue at the Hinata House, the tenants of the all-girl dorm band together to fend off the out-of-control "Mecha-Keitaro."

When Keitaro Urashima fails his entrance exams to get into Tokyo University for the second time, he's officially an unemployed and uneducated slacker. To make things worse, his parents have kicked him out of his house. Fortunately, his grandmother owns the fabulous Hinata Lodge and has agreed to take Keitaro in as caretaker. What he doesn't know is that the lodge is actually a girls' dorm and he's the only guy around! Most guys would kill to live with five sexy ladies, but if Keitaro's not careful, this job will kill him.
 
(Source: Kodansha Comics)

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