Ane ☆ Suku ~Wagamama! Ane to Sukumizu Yuuwaku Tokkun~

Mitsuyoshi has an older sister, Kotomi, who is always bossy to him. But she is special.... One day, he drowns in pool, and loses consciousness. When he wakes up, she is looking down his face worriedly. He is saved thanks to her artificial respiratory.... Since then, their relationship becomes closer and...