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My Friend's Little Sister Has It In for Me!

Akiteru Ooboshi is a high‑school cynic who dismisses the usual rites of teenage life—parties, friendships, even romance—as pointless distractions. His world is upended when Iroha Kohinata, the lively younger sister of his best friend, begins to intrude on his personal space, constantly showing up in his room and turning his routine into a whirlwind of playful torment.

The series blends lighthearted comedy with gentle romance, painting a slice‑of‑life portrait of reluctant affection and growing up. Its charm lies in the relentless banter between the two leads, the quirky school setting, and the slow‑burn tension that keeps viewers guessing whether Iroha’s teasing is merely mischief or something deeper.