If you're looking for manga similar to Kyou mo e ni Egaita Mochi ga Umai (Light Novel), you might like these titles.
Solon, who has been exiled by his comrades, met the secluded and lonely princess, Philia. She believed in his words that ' as long as you have knowledge of magic you can be free.' With the request of his former mentor, Solon became the girl's private tutor. To protect the girl from assassins, they were sleeping together inside a room with a barrier. They went everywhere together, from choosing magic staffs to fighting ghosts. With that, Philia’s training as a magician has started, but it looked like the main figure of the Empire’s schemes was starting to move… A magic swordsman who was despised because of his versatility and inferior skills met the uncommon princess.
Albert, who had learned the beginner-level spell Magic Arrow at a very young age, was expected to do great things in the future. However, he was unable to acquire any other spells. Albert’s father was a noble who heavily valued his dignity, so he banished his good-for-nothing son and granted him a house to stay in. There, Albert would live out more than ten years reading Magic Arrow spellbook. After day after day of practice, he would unknowingly break the limit of his spell. To a young lady despairing that she would miss her exam, Albert would say: “I’ll take you there with Magic Arrow.” “How are you gonna do that using a spell with a firing range of 50 meters?” This is the story of a man pushing through hardships using his dysfunctional spell and eventually becoming the strongest magician—all while convinced that his Magic Arrow is only slightly stronger than most.