I will do my best with my older brother! - a new work by studio Neit, released in October 2018. 

The hentai tells the story of a romantic relationship between an older brother and his younger sister. Mai-chan has been in love with her older brother for a long time, but he practically pays no attention to her. This time, the girl gathered all her courage and confessed her love. The brother simply couldn't believe what he heard...