Yukiko

Mikukan
She appears to be best friends with Mikukan. Mikukan is truly aware of Yukiko's PTSD. Yukiko saved Mikukan from...

But there's two conflicts. When Yuki saved Miku from the falling spotlight, the spotlight appeared to fall a little late but it was close to hitting Miku. Miku thought Yuki ruined Miku's performance on purpose making her yell at Yuki til she cried and ran away. And if Mikukan let Yuki down roughly or softly but didn't spare her feelings, Yukiko will purposely trigger her PTSD and kill Mikukan.
 * 1) A falling spotlight
 * 2) Ghosts
 * 3) Eating sharp objects with a spell to look like candy and taste excellent
 * 4) Yukimi

Vanalla
She appears to be good friends with Vanalla. The only time they had long conversations, is when Mikukan is kidnapped. They both really care about Mikukan.

Romeo
She has a crush on Romeo after she saw how much he gave up for Yukiko.

Hina
She's in good terms with Hina. She feels empathy for Hina's horrible appearance.

Sagimi
Like everyone else, fell for her dainty behaviour.

Deaths

 * 1) Decapitates herself, but in her vision, she was decapitated by Yukimi
 * 2) Jumps off the balcony, but in her vision, she was pushed off the balcony by Yukimi
 * 3) Stomps her feet, wood breaks below her feet, creating a hole, and falls to death. But in her vision, Yukimi was doing that.

Kills
Since Yukiko suffers PTSD, she has a large amount of kills. This section also includes every time Yukimi killed Yukiko.

Mikukan

 * 1) Decapitates Miku if she decides to let Yukimi pull her hand.
 * 2) Slashes Miku a couple of times and if she doesn't use the aid kit in time Miku will die of blood loss
 * 3) (This is the first good Yukiko kill) If Yuki fails to perform a heart transplant on Miku, she'll die of lacking a heart.

Vanalla

 * 1) Cuts Vanalla's body and digs out his organs.