The 8th son? Are you kidding me? (Hachi-nan tte, Sore wa Nai deshou!) Light Novel Volume 10, 11, 12
Hachinan tte, Sore wa Nai Deshou!
Copy paste from https://infinitenoveltranslations.net/hachinan-tte-sore-wa-nai-deshou/
and compiled into epub format
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