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I'm Being Spoiled By My Cousin Big Sister?

いとこのお姉ちゃんに甘えちゃう?

Masato Ooizumi has just started high school and, due to unforeseen circumstances, finds himself moving in with a relative. His new home is shared with his older cousin, a university student who immediately begins treating him with an affection that feels far too intimate for their familial relationship.

Under the same roof, a new daily life begins, filled with awkward moments, teasing advances, and a growing, confusing tension. Masato must navigate this sudden cohabitation, trying to balance his studies with the unpredictable and increasingly close attention of his 'big sister cousin'.

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