Yumi

Yumi is a student in the Seraph of the End: Guren Ichinose: Catastrophe at Sixteen manga. She is often seen with Seishirō Hīragi who she attends Shibuya High School with.

Appearance
She has long light colored hair that reaches down to her back. As a student Yumi wore the First Shibuya High School female uniform. This consisted of a sailor fuku, made up of a blouse with red trim around the collar and a grayish blue sailor-style collar, which also has red trim. The Order of the Imperial Moon emblem, which is a pentagram design, was located on the right breast.

Personality
Willing to physical engage with others to stop them attacking Seishirō, she also made verbal threats to deter further actions. Yumi saw no such issues with others being attacked and belittled.

Story
Stopping Shigure Yukimi from punching Seishirō Hīragi after he kicked Guren Ichinose, and questioning if she knows exactly what she is doing, Yumi details that to raise a fist at this Seishirō means certain death.

Yumi had survived the massacre that took place due to the Hyakuya Sect's attack. After news spreads about Kureto Hīragi having made Guren his subordinate, Yumi is waiting with Seishirō outside the school. She is pleased to see him punch Guren then declare to not come after him again.

Seishirō
A friend of the son of the head of the Hiragi family, Yumi takes measures to defend him and seems to enjoy the influence he has over others.

Shigure Yukimi
Stopping Shigure from fighting, Yumi mentions death as the penalty for her action.

Guren Ichinose
Likely observing Seishirō assault this member of what student see as an inferior family house, Yumi did not comment on the physical violence he endured.