You Can Have My Back, Vol. 2 (light novel)

Leorino, the fourth son of a margrave, retains the memories from his past life as the knight Ionia and love for Prince Gravis. Leorino is unaware that he has come under the prince’s protection. Prince Gravis’ decision results in backlash against Leorino, and interaction with a jealous colleague ends in Leorino falling down a flight of stairs. ??