Episode Libra Part 2. Kotarou has been working hard to study and find a cure that could heal Yui's illness. He begins to think it is thanks to them that he found a treasure important enough to him to care for. Yui, however, falls in love with Kotarou and she lets him know of her feelings but Kotarou, even though he sees her as a girl most important in his life, knows his love for her is that of a love for a younger sister and thus he decides to let the confession slide to try and not ruin the relation he has with the twins...