Summer Solstice has been brought to this world through her fate and she has to embrace her fate otherwise she would end up dead because there are a lot of creatures that are looking for him. Spring Court heir is also in the academy and he wants to defeat Valerian in every competition. For this purpose, he is after Summer i.e to get her under his control.
Summer on the other hand is trying to strengthen her bond with Valerian which does not look possible at all. Meanwhile, the dark forces are gathering around the academy and if something is not done very quickly then the academy and the world of fae will perish. Without this, you will not enjoy Evermore Academy: Winter and Evermore Academy: Summer because the stories are interconnected in a strong way. The development of the scenes is also well linked throughout the series and in every chapter.