Love Hina, Happy☆Lesson (TV) Recommendations
Both involve one guy trying to get by in life while having multiple girls who live with him interfering in some way, very funny and humorous, also has fan service
both series featured girls wielding swords (motoko aoyama and yayoi sanzenin), and childish characters (kaolla su and uzuki shitteno), and have 5 girls and one guy under one roof
Both were tagged as Harem and romance.
Both lead male characters got into the harem by accident.
Both harems often give their male characters a headache or other bodily sufferings that they received throughout the season of the anime they belong to. .
Both lead male characters are not doing very well with their studies (not making it to "Tokyo University" also qualifies).
Both lead male characters has one female member of his harem whom they feared the most.
In one anime it is the harem who came to the lead male character, while in the other anime it is the lead male character who came