Tear Jerker / Gaara Hiden: A Sandstorm Mirage

• Some time in the past, Shijima willingly became Orochimaru's test subject for his experiments to unlock the secrets of the Sharingan. But it ended in failure, so she has to wear a pair of thick glasses at all times, since she can't "turn off" her eyes. Also, because of that, she had to abdicate her position as the heiress of Hōki family in favor of her younger sister, Hakuto.
• Even though there is plenty of political machinations behind the council wanting to marry Gaara, deep down their true motivation is that they want to make up for causing Gaara to live a hard life by giving him a family and wanting him to be happy.