A nerdy second-year dental student Pi falls in love with a kind-hearted fellow second-year Muang Nan from the Faculty of Allied Health Science; but he's too scared to confess. Muang Nan is like a "fish upon the sky", way too out of reach for someone as boring as him. That's why Pi asks his big brother Duean for some advice. After going through a major makeover with the help of his brother, the now cooler-than-ever Pi plucks up enough courage to approach Muang Nan. But a new problem arises when Mork, the hottest medical student, appears out of nowhere and seems to be aiming for Muang Nan, too. Discouraged and very much afraid, Pi once again turns to his big brother for help. But this time, Duean is caught up in a mess of his own when he can't shake an annoying freshman medical student Meen off his side. And so Pi must face this battle alone to win Muang Nan's love. But as the rivalry goes on, why does it feel as if Mork is hitting on him instead? Pi plunges into full confusion as his feelings for Mork start to change. What should he do with this feeling and will he ever dare to confess?
Pi is living a relatively lonely existence without any friends or a romance of his own, until on a rainy Valentine's Day he meets Muang Nan who shows him some kindness. Pi immediately becomes smitten for Nan but as he tries to get closer he realizes that he might just have a rival for Nan's love in the second year medical student, Mork.
Pi undergoes his makeover, courtesy of the Kitty Gang, but his plans to leverage his new look to gain Mueang Nan's attention gets interrupted. Duean and Meen are assigned a group project together in class.
Pi learns a myth about the Gross Anatomy Lab that says if he makes a wish at night and knocks on the cadaver table, his wish will come true. Pi sees this as his chance to wish for a date with Muang Nan. Meanwhile, Duean is sent on a mission to retrieve Meen's water bottle that he gave away to a garland vendor.
Pi wakes up to realize that he has not kissed his crush after all, but instead kissed his love rival, Mork! The situation is exacerbated when two shippers misunderstand the situation and create a fan-page for the MorkPi ship.
Pi confronts the rumors that he is dating Mork. Duean and Meen take a trip to a province for a school project.
The Kitty Gang joins Duean for his service project. Pi finally opens up to Muang Nan about his true feelings.
Confused in love, Pi reaches out to his oldest brother, Wan, for some advice.
Pi releases his frustrations on Mork and the admins of the fanpage for perpetuating rumors about them dating. Afterwards, Mork keeps his distance from Pi, until he introduces his "ex-girlfriend" Bam.
Mork and Bam happen to appear wherever Pi is, increasing his frustration. Meen learns the truth about the fifth year student in his class.
Pi agrees to date Mork but on a few conditions as terms of their probation, specifically, no one can know they're dating.
Duean's final exam approaches leading to a late night study session with Meen. Mork celebrates his birthday with Pi, but Pi's anxiety of people learning about them remains a barrier in their relationship.
Pi finally feels ready to be open about his relationship with Mork, but when someone posts pictures of him online pre-makeover Pi once again fears what others will say about him.
Complete episode guide for Fish Upon the Sky with detailed information about every season and episode including air dates, summaries, ratings, and streaming availability in Japan.
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