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What is the plot?
Taiki Inomata scores the game-winning point against Shoichiro Kishi in their singles badminton match, securing his victory right at the start of the episode.
Chinatsu Kano texts Taiki immediately after the match, inviting him to the aquarium as promised since he won.
Kyo Kasahara and Hina Chono see the text on Taiki's phone, with Hina teasing him playfully about the date while appearing supportive.
Hina's friend notices Hina looking upset shortly after the teasing, revealing her hidden disappointment.
Taiki does push-ups outside his house to hype himself up before the date, feeling a mix of anticipation and fear about Chinatsu possibly liking him romantically.
Taiki arrives late to the aquarium date, initially overthinking the situation and struggling to enjoy the moment with Chinatsu.
A child causes Taiki and Chinatsu's hands to touch accidentally, snapping Taiki out of his overthinking and bringing him back to the present.
Taiki and Chinatsu spend the rest of the date in a sweet montage, admiring various fish and aquatic life, hugging mascots, taking pictures, and bonding outside of school and home.
Rippling water patterns and sharp spotlights illuminate the aquarium, highlighting Chinatsu with a strong outlining shine that enhances the casual magic of the sequence.
Throughout the date, Taiki continues wondering internally why Chinatsu invited him, questioning if it was a whim or a sign of her feelings for him.
Chinatsu confesses unexpectedly to Taiki during their time at the aquarium.
Taiki responds to Chinatsu's confession gracefully, assuring her that no ill will was ever present toward her.
Taiki sends Chinatsu a cute penguin sticker for her phone messenger, telling her that if she ever needs to talk about anything again, she just has to send that sticker and he'll come running.
Hina realizes her true feelings for Taiki, becoming aware that she may not be as okay with his budding relationship with Chinatsu as she thought, leaving her on an emotional cliffhanger.
What is the ending?
Hina follows Chinatsu home in the rain to return her forgotten phone, only to see her arrive at Taiki's house, leaving Hina slumped against a wall outside, crushed by her unspoken feelings for her childhood friend.
Taiki arrives late to the aquarium after oversleeping, rushing in while still nervous and overthinking the invitation from Chinatsu. Chinatsu waits patiently inside, dressed in a summer outfit, and the two meet up near the entrance where she apologizes for discouraging him the day before about his badminton dreams. Taiki accepts her apology right away and tells her he's always open to hearing her worries if she wants to share them. A child bumps into them, causing their hands to touch briefly, which snaps Taiki out of his anxious thoughts and brings him back to enjoying the moment. They spend the rest of the date in a montage walking through the exhibits: they admire colorful fish swimming in large tanks, watch other aquatic creatures like jellyfish floating gracefully, hug oversized mascot plush toys of sea animals, and take photos together smiling at the displays. Taiki internally wonders throughout if Chinatsu invited him just on a whim or if it signals something more from her side.
Later, back at school, Taiki thanks Kyo for helping set up the outing that led to the aquarium visit. Kyo casually mentions the possibility that Chinatsu might like Taiki back romantically, catching Taiki completely off-guard and making him flustered. Kyo and Hina both urge Taiki to refocus on his badminton practice instead of getting distracted by these thoughts.
Meanwhile, Hina notices her own shortcomings in badminton and practices harder on her own. After one session, while deep in thought about where to improve, she accidentally bumps into another student and sprains her ankle. This sends her into a brief panic on the ground, but Taiki happens to come by and helps her right away. He listens as she vents her worries about her game, and she subtly hints at her jealousy toward Chinatsu during the conversation.
The episode closes with Hina deciding to follow Chinatsu home through the pouring rain, carrying the phone Chinatsu forgot at the doctor's office earlier. Hina watches from a distance as Chinatsu arrives at Taiki's house, entering inside. Seeing this, Hina slumps down against a nearby wall in the rain, her face showing devastation and confusion as her true romantic feelings for Taiki fully hit her, leaving her alone and emotionally broken in the downpour.
At the end of the episode, Taiki has just completed a wholesome first date with Chinatsu at the aquarium, growing more comfortable with her while remaining hopeful about her feelings, and he continues his badminton training at school with support from friends. Chinatsu has followed through on her promise for the outing, apologized to Taiki, shared light moments with him, but left her phone behind and ends up at Taiki's house, her motivations for the visit unspecified. Hina realizes and confronts her own jealousy and love for Taiki after witnessing Chinatsu at his home, left crouching heartbroken in the rain outside. Kyo remains a supportive friend, teasing Taiki about romance while pushing him to practice.
Is there a post-credit scene?
The search results provided do not contain information about whether Blue Box Season 1 Episode 5 "Aquarium" includes a post-credit scene. The available sources focus on the main plot events of the episode--Taiki's victory in his match against Kishi, his aquarium date with Chinatsu, and their emotional reconciliation--but do not address post-credit content.
To answer your question accurately, I would need access to sources that specifically document the complete episode structure, including any scenes that appear after the credits roll.