http://www.mangago.me/read-manga/urusai_kurai_no_kokuhaku_kudasai/uu/urusai_kurai_no_kokuhaku_kudasai-chapter-1/31/
All I know is that the author is the one who made sayonara game, just search it
(づ ̄ ³ ̄)づ
http://www.mangago.me/read-manga/hinadori_wa_shiokaze_ni_madoromu/
http://www.mangago.me/read-manga/urusai_kurai_no_kokuhaku_kudasai/uu/urusai_kurai_no_kokuhaku_kudasai-chapter-1/31/