Innocent Gray Company's "The Box of Love", the prequel is "The Madness of Love".

The heroine’s name is Kametsuki Kazuna, and his sister’s name is Kametsuki Yura. It is recommended that you experience Moon Madness first, so that you can fully understand the relationship between the characters in it.

The line you are talking about is Snow Tsubaki. Last month, because Yura couldn't get the love of the male protagonist, she felt that her sister and Nai were hindering her. Over time, she turned into endless hatred for her sister, and she had been waiting for an opportunity to retaliate, killing everyone in the hospital and then It was so dark to eat that section. . . There will be two options in the theater, watching the history of winter/watching the stage. One option ends with the sisters dying, and the other option ends with the sister dying. In the end, the hero feels ashamed of Yura and chooses to leave the heroine. .

After the Snow Tsubaki line is completed, restart the game, and the White Grass line will appear. This storyline is purely about love. Yura has been reflecting on what he has done in the past in the hospital (for details, please see "Love Prison Moon"), and confesses his feelings to the hero. In the end, the hero and Yura eloped XD.

If you want a CG package, leave your email XD. . . .