Minato Sahashi was living a normal life; he had just failed his college entrance exam for a second year in a row, and lived a quiet life in a single's apartment. That is, until the busty Musubi fell from the sky on top of him! She is a Sekirei, one of 108 that are destined to fight each other until only one remains; and he or she will ascend to heaven with his or her chosen one known as an Ashikabi. Minato soon finds himself in the embrace of Musubi, becoming her Ashibaki - but his life will only become more complicated. Musubi isn't the last to claim Minato as her Ashibaki, and what's worse, plenty of other Sekirei and opponents stand in his way!
When Mikuri Tomokazu fell asleep on his 16th birthday, he expected to dream of girls and happy places -- but instead found himself on a strange battlefield in a desolate world! Now, Mikuri is saddled with the responsibility of saving the both the human and dream worlds from forces that could spell their destruction! But, more importantly, he is also saddled with a legion of adoring voluptuous girls. Questions abound: Who will Mikuri grope next? Will he ever score? And, less importantly, will the world be destroyed?
Both are harems with multiple love interests. The previous seasons of Zero no Tsukaima had some fighting like Sekirei but this season particularly reminded me of this Sekirei. Both anime are about men who are caught up into a new (figuratively or real) world that they never knew existed and make a contract with a girl. SPOILER: Both men end up contracting with multiple women and have to deal with the jealousy that ensues.