1 - Classmate Relationship - after 5 or 6 chapters it hasn't been updated
OR
2 - Endoukun No Jikken Note
http://www.mangago.me/read-manga/endou_kun_no_jikken_note/
This precious story hasn't been updated for like 2 years now..
I don't know which language you are considering. So only these 2 for now dear.
(๑•̀ㅂ•́)و✧
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