http://www.mangago.me/read-manga/sora_o_daite_oyasumi/mh/v01/c002/1/First page, thank you.
Sorry following
looks like illustration by Hasukawa Ai, most likely from novel
It's a novel "Hanayaka na Junjou" written by Sakiya Haruhi and illustrated by Hotagawa Ai
https://bookstore.yahoo.co.jp/shoshi-360817/
Oh~ Thank you guys for helping me find it !!Too bad I don't know much japanese to read it compleetely nor have enough money to buy the whole thing TwT But I hope if anyone does they enjoy it very much (๑•ㅂ•)و✧
http://www.mangago.me/read-manga/sora_o_daite_oyasumi/mh/v01/c002/1/
First page, thank you.