I decided to make this based on the DDLC Exit Music mod. I was like: "What if Monika saves Natsuki and changes the script? What if she was revived?" So here you go. Enjoy.
WARNING, THIS WILL CONTAIN SPOILERS OF DDLC EXIT MUSIC MOD!

Hikaru had suffered depression after Natsuki's suicide. He looked at a knife. He grabbed it. He won't go on dates with other girls. Natsuki was the only girl that he truly fell in love with. He rolled up his school uniform sleeve. He began remembering the thoughts of Natsuki.

Every day he would try to read Parfait Girls to remember Natsuki but it always failed because it pissed him off every single time he read it. He then slowly began cutting himself. (Side note: The protagonist never done this so this is like made up).

He began crying as the pain coursed through him but it felt...nice. After cleaning it and placing a band-aid on it, he grabbed his bag, put his shoes on, and headed out. He didn't want to go to school, but he knew he had to.

Once arriving, he didn't speak with anyone. Not even to Sayori as they walked together to school. 'This is all my fucking fault.' He thought in his head. 'It's my fault that Natsuki died. It's all my fault.'

Later on...

He arrived in the Literature Club. Monika, Yuri, and Sayori knew what pain he was going through. He didn't want to talk to anyone. He didn't want to write poems. He took a piece of paper out. He had wrote a poem on it. He stared at it for a few seconds. He then started to rip it, which caused Monika's, Sayori's and Yuri's attention.

"Hikaru? What are you doing?" Monika asked to him. "None of your fucking business." Hikaru replied. Monika felt taken aback from those words. Hikaru then made one final rip. He then looked at the girls. Sayori and Yuri were whimpering and trembling while Monika's eyes were widened.

"I'm going fucking home. I'm not interested in anything today. Fuck this." Hikaru said and grabbed his bag. "See you later..." He added and left. Monika went after him after she told Sayori and Yuri to go home.

Once Hikaru got home, he locked the door. He knew that Monika was going after him. A knock proved that correct. He sighed and looked through the peephole to see Monika. He kept the chain and opened the door. "What the hell do you want, Monika?" He asked to her.

"I just want to see if you are alright." Monika asked. Hikaru scoffed. "I'm fine, thank you." He said. "Now leave!" With that, he slammed the door on her face. She just stood there. It began raining. She then walked off the porch.

She then looked at the sky. (Note, when she says the name Kiseki, this means she is talking to the player xD)

"Hey, Kiseki?" She asked. "What am I supposed to do?"

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Help him. He needs Natsuki.
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"How can I?" She asked. "How can I help him?" She then realized. "I see what you mean, Kiseki." She said. She smiled and began to get to work editing the script.

Meanwhile...

Hikaru was crying again in his bathroom. He couldn't handle the loss of Natsuki. "This is my fault, this is my fault, this is my fault, this is my fault." Hikaru kept repeating and repeating. He then left his house and walked to a bridge.

He looked down. He knew that if he jumps off, he will be dead. He didn't care though. All he wants is to be with Natsuki in the next life.

Meanwhile...

Monika finished editing the script. Natsuki was standing beside her. "M-Monika?" She asked. Monika then hugged her. "Thank goodness you're okay!" Monika said as she began crying out of happiness. Natsuki hugged back as she realized what she was talking about. "Wait, where's Hikaru?" Natsuki asked. Monika then realized where he was. After all, she is the President.

"He's at a bridge!" Monika said. "What?!" Natsuiki exclaimed. "Let's go before it's too late!" Monika exclaimed. Sayori overheard and walked out. "Natsuki!" She said happily and hugged her. Natsuki hugged her back also. Yuri also hugged Natsuki while she was passing by. "Natsuki...about what I-" Yuri started but was cut off. "Apology accepted." Natsuki said with a smile. Yuri smiled back and they ran to the bridge where Hikaru was at.

Meanwhile...

Hikaru grabbed the rail of the bridge. He was going to do it. He was going to end it. He then began getting ready to jump. "No!" Sayori screamed. "Don't do it, Hikaru!" Yuri screamed. "Hikaru, stop!" Monika screamed. Hikaru didn't listen and...

"HIKARU!!!!!" The next voice yelled. Hikaru stopped as he recognized thay voice. "N...Natsuki?" He said and looked to his right to see her. She was crying. She hates to see him die. Hikaru then shook his head. 'This must be a dream.' He thought in his head. He then jumped forward, which caused Sayori, Monika, and Yuri to scream his name.

However, instead of feeling water, he looked to see Natsuki has grabbed his left arm. "I'M NOT GONNA LET YOU DIE, HIKARU!" Natsuki yelled. Hikaru looked up to see Natsuki was crying harder as she pulled his arm while fearing that she might drop him and it would be the end. The rest of the girls rush to aid Natsuki. Once the girls pulled him up, Hikaru looked around but was stopped as Natsuki then hugged him while crying hard.

Hikaru didn't hug back as he still thinks he's dreaming. Natsuki then shook him. "DON'T YOU DARE DO THAT AGAIN!" Natsuki cried out as she cried. Hikaru then realized he was not dreaming at all. He hugged Natsuki and began crying as well. "Natsuki, I'm so sorry!" Hikaru said while crying. They both are crying together now. This sight began to make Sayori, Monika, and Yuri cry. They almost lost a member. A member that is so special to them. But thank goodness Monika brought the one girl Hikaru always loved.

Later on...

Prior to this, Hikaru had managed to get a real diamond ring. He couldn't wait to propose to Natsuki. He waited for the perfect moment. And now is the time for the perfect moment to begin. He waited for Natsuki as she was showering. She had found out about her father getting arrested. As she was done, Hikaru covered his eyes so he wouldn't see her. "Hey, Hikaru." She said and slowly removed the towel. "I'm not looking." He said so she wouldn't call him a pervert. Once she finished changing, she got into the bed wearing a light pink tank top with purple shorts.

"Hey, Natsuki?" He asked. Natsuki turned to look at him. "Yes, Hikaru?" She replied. Hikaru blushed. "I'm sorry for what happened today." He said. Natsuki nodded. "It's fine, Hikaru." She replied. "But you really scared me with that." Hikaru began slowly crying again.

"I know and I'm sorry. " He said. "You know, Natsuki. I always want to be with you." Natsuki looked at him. "Me too, Hikaru." She replied. Hikaru then pulled a small pale purple box. "I want to ask you something, Natsuki." He said. "And please be honest."

Natsuki slowly nodded. He then opened the box to reveal the diamond ring. Natsuki gasped at this. "Will you marry me?" He asked to her. Natsuki began crying softly. "N-Natsuki?! I'm sorry! I should hav-" He was stopped by a kiss on the lips. "Of course I'll marry you!" She said. Hikaru smiled and his tears turned from tears of sadness to tears of happiness.

Side note: I was gonna put a lemon in his but I chose against this because I'm not sure if I want to do that and I think it sort of would not make sense.