 If you liked
Kimi ni Koishite Ii desu ka.
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 ...then you might like
Kawaii Hito
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Both have the same basic premise: boy (or man in the case of Kawaii Hito) with a scary appearance is actually a sweet person. Similar romance present in both stories; while Kimi ni Koishite is mostly a getting together story, Kawaii Hito is more of a being together story.
Simple, sweet love stories without too much drama or angst and lots of cute fluff.