Sentaku no Toki

Sentaku no Toki is a manga written and illustrated by GUNCHI Kiri. It is serialized in Jump SQ.

Plot
During summer break, a junior highschool student Mitsuharu collides with an unusual creature while speeding on his bicycle. That unusual creature was a genderless alien called Toki who came to Earth for a "purpose". An unpredictable story about a lonely human and an alien starts!