The Eye

The Eye is an unofficial term that refers to the single very large eye from the Seraph of the End series that was observing Mikaela Hyakuya.

Appearance
From the black round pupil is the lighter in comparison colored iris. This is comprised of different shades, namely a thick slightly lighter ring connected to the pupil. Midway is a dark ring like pattern circling around the pupil. Overall from between the pupil and the dark outer section of the eye the iris appears to have many straight streaks of light within it reminiscent of sun beams.

The white sclera is strained with what resembles many thin blood vessels that lead inwards towards the centre. The upper and lower eyelid have no major distinction between them, the general shape is more symmetrical than not. The eyelids are parted wide as if it were staring so that the sclera is fully visible.

Details
As an organ it would be a complex eye if it were capable of seeing where Mika was. The lens of the eye appears to reflect something that is bright. It silently watched a target although whether due to it being conscious or not remains unclear. Whether it needed the illumination to see him in a world of pitch dark there was a steady stream of light particles floating vertically down outwards from the eye upon Mika, and from quite high up.

The small area of luminescence around Mika's feet may have moved with him as he walked due to the eye. If it is an organism the eye belongs to there are no additional features associated with eyes such as eye lashes, and of course nothing else seen aside from the single eye itself.

Story
In a dark empty appearing world light sprinkles down on Mika who gains an awareness to say aloud where he is, and further question what is this place to Yu. The eye is looking down as Mika looks up. Gazing at him, the eye appears to come down to Mika's level. Unresponsive to his questions, the eye is regarded as appearing kind where it does not see Mika as an enemy.

With Mika asking why this is so far inside Yu, and saying he wants to look inside, the eye stares ahead as Mika's shimmering hand reaches towards it. From this interaction, Mika accesses a past memory where individual disembodied eyes were kept in fluid filled tanks. Noya Hienma was able to motion for a child Yu to be formed from one of the eyes.

The eye and then child Yu that witnessed this also saw Sika Madu enter the room where the body of Michaela was kept, alongside his demon apostles. This included Raimeiki and Byakkomaru, along with Kiseki-o and Gekkouin.