The finale of Horimiya left a bittersweet taste in viewers' mouths. In the last episode, Kyoko Hori, Izumi Miyamura and their friends are graduating high school. Although this is a celebratory milestone for everyone, it is purposefully used as an introspection to Miyamura’s character. He reminiscences on the significant moments of his high school life, reflecting how much he has grown and matured over the years as he went from being a social outcast into a down-to-earth, kindhearted classmate and friend to everyone.
Although the finale provides a nice wrap-up to Miyamura’s character, it failed to provide any answers or conclusions to various plot points presented throughout Horimiya. As a result, viewers are left with several unresolved questions -- which begs the idea of a potential movie or OVA in the future.
Horimiya's first and biggest question is whether or not Hori and Miyamura will get that fairy-tale happy ending usually seen in shojo manga and anime. The last episode, “I Would Gift You the Sky” showcases the couple walking alongside each other and Miyamura thinking of all the things he loves about Hori, subtly implying the two will stay together long term. However, in Episode 12 Hori confesses she wants to stay with Miyamura after high school, and he responds with a marriage proposal.
But it isn’t enough to know they will get that happy ending -- viewers want to see the process of how they get to that point. In fact, Miyamura has yet to introduce Hori to his family, and there could be some concerns of an early marriage given the fact that Hori’s parents married very young too. As it stands right now though, it seems Horimiya viewers can only assume that the two have a blissful marriage.
Another key plot hole that deserves a solid conclusion is the relationship between Toru Ishikawa and Yuki Yoshikawa. The two originally started as a fake couple so Yuki can easily reject Akane Yanagi’s love confession. However, Toru and Yuki eventually catch feelings for one another but are too shy to say anything. In Episode 10 “Until the Snow Melts,” their relationship hits a hurdle when Sakura Kono confesses her feelings for Toru. Toru tells Yuki that he rejected Sakura’s confession and subtly hints at his feelings by telling her all the things he likes about snow, which is “yuki” in Japanese. But this metaphorical confession isn’t enough to declare the two as an official couple. Therefore, viewers wonder whether or not Yuki and Toru will ever sincerely confess their feelings.
Horimiya's finale also does not give a satisfactory ending for the various other supporting characters. Remi, Yanagi, and the rest of the side cast desire a possible road trip with friends since everyone is graduating. It never actually happens, but these hints set up the potentiality of a future movie or OVA, where all the cast members get together one final time.
Two new OVAs were released in May 2021 -- but these are based on the original series, Hori-San to Miyamura-kun, and not the manga Horimiya by HERO and Daisuke Hagiwara that the anime is based on. The OVAs do not cover the plot holes found in the anime, so a separate movie or OVA is still desired.
As for a possible second season of Horimiya, the graduation ending leaves little room for more story since the manga primarily focuses on Hori and Miyamura’s life during high school. However, Horimiya could go the same route that Kyoto Animation took for their series Tamako Market. This includes a movie entitled Tamako Love Story, which focuses on a romance between two characters that didn’t come to fruition in the main series. The Horimiya franchise could do this too, given the fact that there are relationship stories without firm conclusions. A second season is highly unlikely, but a Horimiya movie or OVA is still a possibility.