Fics like Our Adorable Underclassman

Izuku born 1 year younger than everyone, is befriended by Itsuka at an early age who proceeds to become an older sister figure in his mind and him becoming something to protect in her's making her want to be a hero more for him. After Itsuka gets accepted to UA, his bullying gets worse until he meets All Might and becomes his successor. After a year of training he surprises everyone by being able to enroll into UA. Seeing how popular he becomes with her friends and her own feelings, Itsuka decides that she'll stop being an older sister in his mind or die trying Izuku x itsuka/ everyone Class A and B girls are second year Mei and Nejire are first year students

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