Mushi to Medama Series

Mushi to Medama Series (蟲と眼球シリーズ) is a light novel series by Akira with illustrations by Mouse Mitsuki. A manga adaption called  Mushi to Medama to Teddy Bear with art by Yuriko Asami was serialized in Comic Alive.

Plot
Sakaki Guryuu is a multi-talented genius who, despite being gifted and wealthy, decides to teach in the countryside to be together with his lover, Usagawa Rinne, who also happens to be his student. Their peaceful lives are shattered one day when Rinne is killed, in front of Sakaki's eyes, by a girl named "Gankyuu Eguriko," who gouged her eyes out with a spoon. Things take an even stranger turn when Rinne suddenly wakes up as if nothing had happened, and something called an "Eden's Apple" is thrown into the mix.