For some reasons, I can't leave a comment on the English version... I hope it's okay if I write my comment here...?
There are many reasons why this game it's so good... Not stellar, mind you, yet good in absolutely ever domain.
The plot is just believable enough, satisfyingly realist, the heroine is likable, mature, vulnerable just when it serves her character development, the BO is just great, the backgrounds are peaceful, the art-book is a huge bonus, the chibis are to die for, and the mannerisms and decisions of the Sea Dragon is lovely.
There is a ending the heroine can have without romancing either of the characters, one where she can just be friend with both, and all are very nice and still fill me with a cozy kind of nostalgia.