Kato Kai is a girl who comes to the Kato family during summer vacation in 'Summer Pockets.' She lives with Yu Yili as a distant relative and has an especially strong passion for fried rice.
| Japanese name | Umi Kato |
|---|---|
| Game voice acting | Aimi Tanaka |
| Residence | The Kato family during summer vacation |
| Signature dish | Fried rice |
The Kato family's interactions
Hai speaks and acts more maturely than her age, and sometimes is quite strict with Yueri. She also goes to the island alone every day, seemingly having her own plans.
Fried rice and terms of address
Fried rice is a dish she excels at and places great importance on. At the beginning of the new route, she calls Hari "Takahara-san," indicating that there is still some distance between them; Yuili wanted to learn more about this girl who always played by herself.
An expanded version of the description
"REFLECTION BLUE" adds Kai's route and lists the expansion of the seven main female protagonists separately. She is not a character who appeared only in this version; the new focus is on the story of their summer interactions.
| Featured works | Summer Pockets REFLECTION BLUE |
|---|---|
| Scope of the plot | 2018 Original ALKA/Pocket; Nanami is a posture formed by borrowing the Seven Shadow Butterfly |
| Scope of the plot | RB Added Umi arc and Pocket added epilogue; Branches should be labeled separately |
Characters and relationships
Hari's distant cousin, living with him at the Kato household. Good at fried rice, precocious in speech, and often goes to the island alone.
Identity in Summer Pockets
ALKA reveals her real name is Yumi, and she is the future daughter of Uiri and Shiraha Ha. She repeatedly returns to summer to see her mother, gradually losing her memory; Pocket borrows the power of the other Seven Shadow Butterflies to form Nanami's form, returning to her mother's childhood.
Identity in Summer Pockets REFLECTION BLUE
In RB's new short story, she spends the rest of the summer with Yueri, experiences breaking promises, hiding in a secret base with island children, and receiving advice. The Pocket epilogue also depicts Yu Wei reaching the future, where she meets the adult Yueri and Shirahane, and the three walk hand in hand on the beach.
Official short story: First to Kato's house
The first part of "Eye" describes Hai visiting with an invitation to organize relics, cleaning the bathroom for the mirror and preparing breakfast. Instead of asking her to tidy up the storehouse, Mirror took her out and encouraged her to play; She later participated in radio calisthenics, learned fishing, and helped the elderly on the island.
RB Umi Short Story: What Do You Do Every Day When You Go Out?
This short story reveals that Hai was previously helping children on the island complete their coursework.
Official website 'Natsu no Ashiato' Culinary Encounter (Spoilers)
In the 2019 official short story 'Summer Footprints,' Kyoko asks Shiraha to teach Kai how to cook, hoping to get closer to her mother. She recreated the fried rice she learned in the past summer. Although Bai Yu gave her full approval, he felt there was no need to teach her, and the conversation ended.
Secrets and advice from the official website 'Natsu no Ashiato' (spoilers)
After seeing Shiraha and Uiri walking together, Umi avoids her. Miki chases after her to hear her secret of repeatedly experiencing summer and wanting to get closer to her future parents. Miki suggested she first face Yuili; Hai then observed his actions and reconsidered his own avoidance of his father.
RB Pocket· Request to Nanami
In the Pocket arc, Kojiu asks Nanami not to mention Shirahane's parents, nor to let him approach the cafeteria.
RB Pocket: Capturing and cooking together
RB Pocket returns to Shiraha's childhood branch, acting as Nanami and joining Shiraha in capturing Inoking and cooking together.
Original island monster: Entry and bait
On July 29th, Yueri can enter the island Mon gameplay through sea activities. After choosing to buy the same item as her and confirming your participation, she will provide initial bait such as sugar water, marking the start of the island mon's capture process.
RB: Two mini-games in the candy store
RB English Guide uses her activities at the candy store as the common entry point for both mini-games: after purchasing the same model, the watch option leads to Daomeng, and the wristband plus the option to receive the racket leads to doubles table tennis. The two modes diverge here.
Related entries
- Featured works:Summer Pockets REFLECTION BLUE
- Featured works:Summer Pockets
- Distant cousin:Uiri Takahara (Summer Pockets)
- Together with Bai Yu, she gave birth to her own father:Uiri Takahara (Summer Pockets)
- A chapter of returning to her mother's childhood as Nanami:Summer Pockets Original Pocket
- A teenage father who still doesn't know their parent-child identity and gives him love:Uiri Takahara (Summer Pockets)
- In the epilogue, the guiding voice of the girl came through:Summer Pockets
- An additional post-reunion with adult parents meeting by the seaside:RB Pocket adds an epilogue
- The adults who welcome and encourage themselves to play in the first part of the short story (official mirror short story):Misaki Mirror (Summer Pockets)
- A chapter revealing one's relationship with parents:Summer Pockets original ALKA
- Focusing on her own interactions with Yueri, the additional short story:RB Umi short story
- Butterfly stories told by oneself and drawn by friends (RB hands-on notes):Butterfly Picture Book (Summer Pockets)
- The final chapter where he hides his identity and is finally recognized by his mother (2018 original Pocket):Summer Pockets Original Pocket
- Arranging an adult to meet Shiraha Manabu for cooking (2019 official website: Summer Footprints):Misaki Mirror (Summer Pockets)
- Listening to Dotsu's secret and encouraging myself to face Yuili's friend (2019 official website: Natsu's Footprints):Miki Nomura (Summer Pockets)
- In RB Pocket, the person who asks herself not to mention Bai Yu's parents and keeps her away from the cafeteria:Naruse Kohato (Summer Pockets)
- RB Pocket Childhood: Capturing Inoking with Yourself, Mother Making Dishes Childhood:Shiraha Naruse (Summer Pockets)
- In the original version, participating in mini-games that provide fried rice-type bait:Shimamon Fight (Summer Pockets)
- RB entering with initial titles adds a new short story:RB Umi short story
- Associated Work:Summer Pockets REFLECTION BLUE
- Relatives living with the Kato family:Uiri Takahara (Summer Pockets)
- The mother repeatedly searched for by her daughter in the past (2018 original ALKA):Shiraha Naruse (Summer Pockets)
References
- PROTOTYPE: REFLECTION BLUE Character Introduction
- VISUAL ARTS: REFLECTION BLUE standard edition announcement
- PROTOTYPE: REFLECTION BLUE Additional content
- Sakatsuku: Summer Pockets original route and chapters
- hideaki: Summer Pockets original story and route review
- dyuxia: Summer Pockets RB Shizuhisa and Shikiyo Umi hands-on play
- E Tian: Summer Pockets REFLECTION BLUE new route completion impressions
- Kohei: Summer Pockets REFLECTION BLUE - Clearance Review
- Key: Mirror Misaki Arc 'Hitomi'
- Shikhirou: Summer Pockets REFLECTION BLUE Impressions (Umi, ALKA, Pocket)
- Key: 2019 Umi Kato Official Website Short Story "Summer Footprints"
- Key: Umi Kato Short Film Release Announcement
- Naru: Summer Pockets REFLECTION BLUE Pocket√ Impressions
- Wu Qiu: Summer Pockets REFLECTION BLUE Completion Reflection Part 2
- Taiyaki: Summer Pockets Island Bait and Capture Records
- Alka Translations: Summer Pockets REFLECTION BLUE Walkthrough
- E Tian: Impressions of Summer Pockets Original Version (Replay)
Rewrite based on the listed materials; No complete lyrics, scripts, or audiovisual materials are included.
Data compiled on: 2026-10-12.