Koi Chirakashite

The characters are pretty shoujo-esque but deviate enough from the norm to not be forgettable. The male characters are mysterious and are mostly tsundere-like. The female characters are shown to be pure maidens freely pursuing love. Pretty much every story has the same formula: Female dumped by ex > New guy enters > Female's reaction > New guy expresses his feelings > Happy ending (preferably with a sex scene) > Conclusion (Confrontation with ex, new guy solving problems, etc.)

The first stories are pretty wholesome but the stories afterwards delve into more dark topics which are subtly highlighted but not expressively depicted (rape, domestic violence, infidelity and so on). Furthermore, this might be a totally subjective view but the quality of the stories start degrading afterwards.