In the wake of their parents' tragic deaths, Benjamin "Benny" Pearl and his sister Juniper ("Joon") grapple with their respective mental health challenges, trying to navigate an uncertain life together. Everything shifts dramatically with the arrival of Sam, a quirky cousin of Benny's friend Mike. Initially hesitant about Sam moving in, Benny's feelings evolve as he observes Sam's unconventional yet effective cleaning techniques and his earnest willingness to pitch in with their daily lives.
As Joon becomes more intertwined with Sam's world, she takes on the role of matchmaker, assisting Sam in composing letters to his mother. This act of kindness sparks a series of events that will test familial and friendly ties. A dinner date between Benny and Ruthie, a delightful waitress at the diner, is interrupted by an urgent call from home, where Joon and Sam's bond is rapidly strengthening.
Amidst a backdrop of blossoming romance, highlighted by a tender kiss at their local diner and a memorable evening spent together at home, tensions rise. Benny's attempts to relate to Joon face increasing resistance, especially as her interest in Sam becomes more evident. This tension escalates when Benny discovers their romantic involvement, leading him to confront Joon with a pamphlet for a group home, provoking feelings of betrayal and anger.
The fallout from this confrontation deeply unsettles all involved. Joon's mental health starts to waver as she finds herself overwhelmed by the tumult within her mind. In this trying time, Sam offers her comfort while Benny stands helplessly by, engulfed in guilt as he watches his sister's world unravel.
As chaos reigns, Benny finds himself in conflict with Sam, who has withdrawn to Ruthie’s place. The grim news from the doctor that Joon wishes to cut ties with him amplifies Benny's sense of regret. Contemplating his past actions, he embarks on a journey of self-discovery, facing the harsh truths of Joon’s struggles and their fragile relationship.
Fate intervenes when Benny unexpectedly encounters Sam again at the local video store, prompting him to reach out for help. Together, they head to the hospital where Benny seeks to make amends with Joon, whose life has spiraled further since leaving home. His heartfelt apology and sincere encouragement for her to take charge of her life serve as a catalyst for healing in their relationship. Touched by his honesty, Joon confides in her doctor, revealing her aspiration to gain independence and secure her own apartment.
With their bond mending, Joon and Sam reconnect, emerging stronger than before. Meanwhile, Benny's affection for Ruthie shines through when he visits her with flowers. However, he is surprised when he arrives at Joon's new apartment to find her and Sam joyfully preparing grilled cheese sandwiches using an unconventional cooking method – a clothing iron – injecting a playful note into their newfound domestic harmony.
