Giving gifts to your students give them motivation and increases their affinity. (+25 Motivation) Giving gifts to students of other houses increases their affinity towards you. Gifts doesn’t consume Activity Points so you can give gifts as much as you want.
If the person likes your gift, they’ll get more motivation (+50) and more affinity towards you (x2). You can select a gift by reading its description, and giving it to the person that matches the gift’s best recipient.
If you’re trying to give a gift to your student, you can review what they like or what their interests are by accessing the Roster, selecting their profile, then switch to the Notes tab.
It’s recommended to avoid giving gifts to characters with high motivation already or pending Support conversation with you. Viewing your student’s support conversation raises their bond with you and also fills up their motivation completely.
You should also avoid giving gifts to characters you’re planning to set as Mission Assistants or Adjutants in the following battles since you can naturally gain affection by fighting with them in battles.