Tasuke is an ordinary schoolboy who is protected by two rivaling guardian spirits, Shaorin and Ruuan. When a third spirit named Kiryuu enters the fray with the apparent purpose of making Tasuke's life a living hell, it’s once again time for Tasuke to demonstrate how any problem in the world can be solved by being a generally nice -- if a bit wishy-washy -- guy. But Shaorin, whose world has been turned upside down, must now learn to cope with new and unfamiliar emotions, as well as discover the true meaning of love.
Kenji Tomosaka is a young boy who moved from the city to a coastal town at a young age. The ocean fascinated him, and that is where he met a girl named Nanami Konoe. Together, they played together on the beach; but unknowingly, they lived next to each other, their balconies just feet apart. As time moves on, their relationship deepens, and many of their friends call them a couple; but neither Kenji nor Nanami is willing to make a move. Time passes, and summer comes again; but this time, something will happen that will change them both forever...
Save for some slight changes in the male lead's personality and the absence of the magical girl elements, Lamune is a fairly close match. Mamotte Shugogetten tends to aim for a bit more comedy, whereas Lamune inserts a bit more drama. Very close in presentation, however, so if you enjoyed one I'm sure you'll enjoy the other.
Fumihiko Matsumaru is a salary man who works in the marketing department of a snack company. As a bachelor, he tried to date a girl from his company; but coincidently, he met Aka Onda, a rookie voice actor, instead. Through another stroke of fate, Aka’s house burned down that very night. With nowhere to stay and no family to aid Aka, Fumihiko took her in; and the next day, Fumihiko’s new marketing idea was accepted, and Aka’s being hired for the product’s voice actor! As the relationship of Aka and Fumihiko deepens, the more difficult their relationship becomes. Can they live together under the same roof while keeping the secret of their relationship safe?
Chances are, if you watched Mamotte Shugogetten you did so because you enjoy slice-of-life and romance anime. Same general idea with REC, only minus the minor harem and magical girl elements. It's a more serious, slightly more dramatic, and more realistic romance.