The culprit is
Yasuko Aijima. Yasuko killed Tokumi with poison that she ended up consuming with the fruit cream puff she ate.
Yasuko had actually poisoned the first chair Tokumi was sitting on and also purposely made it wobbly. When Tokumi notices the wobbliness, she'll think that her weight had broke the chair, and would sneakily try to swap to a different chair. When the lights went out for a little girl’s birthday celebration cake, Tokumi begin swapping her chair by grabbing the bottom while having it pressed against her legs and bottom, in this way avoiding the sounds created from dragging a chair. But by doing so, Tokumi had gotten the poison on her hands. After swapping the poisoned chair with the chair at the table beside, the poisoned chair, being at a different table, would now be considered irrelevant to the murder and there is less chance it would be checked for poison.
All Tokumi had to do was eat something with her hands and that would guarantee her death. Yasuko knew which chair Tokumi would sit on because in every group photo they’ve ever taken, Tokumi always stood on the right, believing that she looked better from that angle. After taking the group photo, everyone would naturally take the closest seat, thus Tokumi would always be sitting on the right. She also made sure that the group would sit at the table with poisoned chair by reserving that table for the group.
Motive
Mao and Sumika furiously ask why she would do such a thing as one wrong mistake could have killed them as well. However, she coldly states that she didn’t care as she wanted them all dead for causing the death of the former Knight Hearts member Kenya Shibumi.
Kenya had been secretly dating someone and he had been exposed after a photo of him with his girlfriend was posted online after a fan took the photo. His girlfriend was revealed to be Yasuko and after his relationship was exposed to the public, his reputation was ruined and he found it harder to produce music and get more sponsors. As a result, he resorted to drinking and one day when he was stumbling across the street intoxicated, he was hit by a car and killed.
Yasuko, being devastated, decided to track down the person who took and posted the photo. It turned out to be a female fan, who she asked to meet at a diner, where she told the fan that she and Kenya were genuinely in love and that the fan had no right to tell the world about them. However, to her shock, the fan revealed that she had learned about Kenya's whereabouts from Tokumi. To add insult to injury, she learned that Mao and Sumika were also present with Tokumi when this happened and they did nothing to stop her. This is why she wanted to kill mainly Tokumi, but also Mao and Sumika for betraying her and for causing the death of the man she loved.
| Accident (past)
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| Location:
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Unknown
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| Victim:
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Kenya Shibami
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| Age:
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Unknown
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| Cause of death:
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Hit by a car
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| Culprit:
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Unknown
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| Kenya was stumbling across the street intoxicated and ended being hit and killed by a car.
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Aftermath
Conan reveals to Haibara that the reason why Chiba, Shiratori, Shukichi, Naeko, Kobayashi, and Yumi had been meeting at that diner was because the three girls told their boyfriends about meeting on the 8th for a special event. The three men believed it to be a romantic date of some sort, and decided to consult the other girls for help to buy a gift for their respective girlfriends.
Ironically, Conan also reveals that all three girls had planned to go to a “Knight Hearts” concert with their boyfriends. They are shown together at the concert, the men, while reluctant at first, decide to enjoy the concert to the fullest.
Arabic
French (Subbed)
Thai
