Mu You had not yet obtained any pages belonging to the summoning category, so he promptly bought one of each.
Of course, the only summoning magic he could level up at this point was the 'Spike Serpent Guard', which went from LV1 to LV5, increasing the limit of summoned spike serpents from one to five.
Then there was this week's magic course.
Out of the seven types of magic taught in the first year, Mu You could learn as many as six!
Little Spider Swarm: A low-rank summoning magic, which summons a swarm of small spiders to assist in your reconnaissance or battle.
Ridiculous Curse: A low-rank curse magic, that changes the appearance of a creature or an object into something you find funny. (Only changes appearance, does not affect the original abilities and characteristics of the entity.)
Forgetfulness Curse: A low-rank curse magic, which can be cast on a creature to make it forget the events of a certain period of time.