 If you liked
Seto no Hanayome
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 ...then you might like
Shakugan no Shana II (Second)
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They both involve romances between inexperienced young children and the characters are both very similar. Nagasumi looks incredibly like Sakai Yuji and is as weak and uncertain of the circumstances as he is. Mawari Zenigata looks like Matake Ogata, both strong tomboys and Seto San vaguely resembles Shana, though personalities greatly differ.