hi! try these one shots:
http://www.mangago.zone/read-manga/blackberry_chocolate/
http://www.mangago.zone/read-manga/adults_who_don_t_understand_love/
http://www.mangago.zone/read-manga/a_certain_boy_and_girl_s_memories_of_a_valentine_s_day_and_white_day/
http://www.mangago.zone/read-manga/make_heroine_wo_katasetai/
http://www.mangago.zone/read-manga/the_story_of_a_girl_who_likes_girls_and_a_girl_who_used_to_be_a_guy/
http://www.mangago.zone/read-manga/iwaneko/
I hope your day gets better! This one shot is cute: http://www.mangago.zone/read-manga/kimi_ga_terasu_koi_no_hikari/

today was a bad day TT can someone recommend a wholesome manga (preferably one shot)
I'm in need of an instant serotonin boost ╥﹏╥