Zero no Tsukaima is a show just for that. You can put your mind in neutral and just enjoy.
There is a lot wrong with Zero no Tsukaima. The animation is not very good, The story feels like its of secondary importance, you can see the plot twists a mile away and it has just about every harem cliche in the book but somehow it works.
The main reason it works is that it knows its own limitations. It sticks to what it is good at. And that is the relationship between Saito and Louise. From the moment Saito falls from the sky after being summoned by Louise we have a nice romantic comedy and like all the best harem comedies Saito sticks with Louise rather than work his way around all the girls. Also Saito discovering bit by bit of previous connections between his world and Louise's.
Most of the comedy is between Saito and Louise which is mainly Saito's wandering eye getting him in to trouble with Louise yet he manages to do it in so many different ways that it never gets old.
This is all very good but what is Zero no Tsukaima about. Well it is about Louise the worst student at a Magic Academy in a world where only aristocrats have magic ability. As part of her studies she must summon a familiar. Seeing her classmates summon some pretty cool familiars Louise summons Saito a boy from from Japan.
Louise at first treats Saito as a normal familiar, making him sleep on a pile of straw and feeding him scraps and getting frustrated at his refusal to obey her but slowly comes to realise that Saito is a human being. However, her pride stops her from not treating him like a servant and punishing him when he does wrong yet gets insanely jealous, becoming completely tsundere, when Saito talks or looks at other girls. Unfortunately for Saito is all the time.
Together they embark a number of adventures and despite Saito's wandering eye he ways is there to protect Louise when she is in danger. A fact that Louise comes to appreciate and slowly accepts her romantic feelings for Saito showing her venerability like all good tsundere characters.
There is also a plot against the Queen, a war and a fantasy host bar run a muscly transvestite.
A nice simple romantic comedy, nothing more nothing less but the all better for it.
