If you're looking for manga similar to Trinity Seven (Light Novel), you might like these titles.
Morioka Yuuto was an ordinary highschooler who was chosen as a candidate for the next Demon Lord. Thus, he was transferred to a Demon’s school, Ginsei Academy where he faced contempt from the other students. “—I’ll make you into the Demon Lord. So…… take me.” Through an encounter with the Demon beauty, Himekami Rizel, Yuuto’s life changed, along with the world. In addition to being able to learn any magic at one glance, he can also infinitely absorb the mana of his harem by maintaining skin contact. This was the special ability which can only be held the human Yuuto. The human Demon Lord candidate aims to become a just Demon Lord and stand against the strongest Demons!
It was an era where a language structure known as the Sacred Tongue allowed one to overwrite the laws of the world like magic—. Young man, Aoi Karen Bradford, was the younger brother of the strongest Sacred Knight in history, as well as an exceptionally talented user of the Sacred Tongue. However, due to a certain reason, he got careless during the entrance exam and received an average grade, entering Sylvius Academy as a normal student and leading life there inconspicuously. Despite being shunned by his peers, he lives peacefully being followed around by the valedictorian of his cohort and childhood friend, Hinohara Yukine, in addition to the exchange student who holds one-sided feelings for him, Carolina. However, a certain incident led to Aoi and Yukine taking on a top-secret mission…?
Saybil is a magic student with no memories of his life before he met a mysterious blond woman in an alley. Now he travels with his teacher, Los—another student, Hort, and the beastman Kudo for “special training”… but this field trip may not be as routine as it seems!