The incident began this morning...when Mahiru spoke to Hiyoko. Mahiru most likely played "Twilight Syndrome Murder Case," the video game provided to us as the motive... She probably wanted to discuss it with someone else who also appeared in the game as a character. Hiyoko accepted Mahiru's invitation and they promised to have a more detailed conversation about it later. However...someone else overheard their exchange: the killer. The killer eavesdropped on their conversation and used their promise to devise a specific murder plan... By preparing a specific item, they planned to manipulate the two's actions.

That item was the letters... They sent fake letters to both Mahiru and Hiyoko. The letter Mahiru received told her to come to the beach house at 2:30 p.m.... And the letter Hiyoko received told her to come to the beach house at exactly 2:00 p.m. By providing different times, the killer was able to lure them to the beach house separately.

Hiyoko totally trusted that letter, showed up at the beach house at 2:00 p.m. just like it said... ...and was drugged into unconsciousness by the killer lying in wait. After putting Hiyoko to sleep, the killer immediately hid her inside the closet... ...so they could frame her as the killer later.

At 2:30 p.m., Mahiru arrived at the beach house. She was completely unaware that she'd been targeted for murder... Approaching her from behind, the killer struck the defenceless Mahiru with a specific weapon. The metal bat that was left at the scene of the crime. The bat was brought down onto the back of Mahiru's head, and with that, she took her last breath... According to Mikan's autopsy...Mahiru died instantly, so she probably never knew who killed her...

With that, the killer achieved their goal of killing Mahiru and began to tamper with the crime scene. They dragged Mahiru's body so that it blocked the door leading to the road... Also...the mask found at the scene of the crime was something the killer personally left... I'm not really sure why... My guess is it's something similar to a calling card. That's how the crime scene we discovered was created. However, by moving Mahiru's body, the killer got blood splatter on them. Plus, the shower room had no water because it was out of order, so they couldn't was it off... But the killer expected something like that to happen. Instead of the shower, the killer used something else to wash the blood off their body.

They used plastic water bottles that were inside the beach house refrigerator. We can assume they carried the bottles to the shower room before the sequence of events had happened... In place of showering, they washed the blood off their body with water bottles instead. However... They had no choice but to dispose of the empty bottles in the beach house's trash can. Littering is against the rules, and it would've taken too much time to throw them away somewhere else. After the killer washed off the blood, they hid in a specific spot inside the closet Hiyoko was in. The killer hid inside the surfboard case that they had already emptied beforehand.

After some time had passed, the sleeping drug used on Hiyoko wore off and she woke up... I can only imagine how badly Hiyoko must have panicked when she came out of the closet. I mean, she made plans to see Mahiru, who lay dead right in front of her... From the shock and panic of being considered a murder suspect... ...Hiyoko fled from the beach house. Because of that, she left footprints in the sand. Everything was a trap set by the killer to frame her.

After Hiyoko left, the killer finally came out of the surfboard case... ...and placed a gummy that they had brought with them to shift our suspicion toward Hiyoko. Ironically...placing that gummy is what helped clear our suspicion toward Hiyoko... Finally, the killer began preparing to escape from the beach house. They couldn't risk leaving their footprints in the sand, so they escaped the beach house using a different route. ...The small window in the shower room. However, that window is rather high up and can't be reached easily... Which is why the killer used... ...the bamboo sword they always carry with them. The killer took the bamboo sword out of its bag, tied the bag to the sword's handle...

...and used the sword as a stepstool to reach the small window, while holding the sword bag in their hand. As long as they're able to reach the window, all they had to do was pull the bag to retrieve the sword. And so the killer left the beach house and appeared before us as if nothing had happened. But...their wet hair and swimsuit didn't dry right away. There also weren't any towels at the beach house... So when the killer met up with us, they said they had been swimming for a while as an excuse...

So how about it!? This is the truth behind the incident you caused! Isn't that right, Peko Pekoyama!?