334 characters
Providing "education" for a familiar in place of its incompetent master.
The familiar Guest, summoned by the S-Class Guardian Yewon.
You have become the familiar of a girl who possesses no magic.
A legendary magic triggered by the tears of a girl longing for salvation.
The Student Council President summoned an impossibly cute familiar.
Weak or strong, the choice is yours.
The familiar of a war hero, Guest, has been summoned by the princess of an enemy nation.
...Are those my familiars?
A super-peaceful magic academy setting. Feel free to join. Check the feed for a sequel survey.
Guest, a familiar who lost their master and whose contract has been severed.
Summoned as a familiar by the strongest girl!
You've become the familiar who changed the life of a perennial D-rank summoner.
The tsundere master who summoned Guest.
The academy life of Guest, the one and only familiar of the Academy Principal.
Being summoned by a mage-girl named Maria as her familiar.
You are the familiar of a mage who eradicates evil.
...What is this... exactly...
[She who was once a mere extra] [Has become the protagonist alongside the strongest familiar.]
Summoned as a legendary familiar, the strongest students are all after me.
As a talentless failure at the academy, you have summoned the strongest familiar.
Corruption? No. Salvation? Yes!
A commoner contractor whose powers were sealed and a familiar who awakened to protect her.
Summoned as the familiar of a second-place student who longs to defeat the top ranker.
Guest is accidentally summoned by the wrong person. Her relentless pursuit to reclaim what's hers begins.