Mahiro and the Midsummer Romance

Mahiro and the Midsummer Romance (まひろと真夏の冒険, Mahiro To Manatsu No Bouken) is Chapter 55 of Onimai: I'm Now Your Sister!. It was originally published on Pixiv on August 27, 2021.

Summary
Mahiro is asked by Satsuki to deliver a love letter to Yuta.

Plot
Miyako slumps at her desk wishing that she had a boyfriend. Mai realizes that it is almost summer vacation, and Miyako admits that wants to have her hot girl summer.

Mahiro realizes that they are around that age, and Momiji agrees that it depends on the person. Miyo thinks that its lovely. Mahiro thinks to herself that she's never had any luck with dating, now or when she was a boy. She adds that she doesn't want a boyfriend in the first place. Just then, Satsuki calls out to Mahiro.

Mahiro looks up and sees Satsuki and Minori standing there. Mahiro asks them what's up, as they usually only speak up to criticize the boys. Satsuki says that she was wondering if Mahiro has her heart set on anyone right now. Mahiro gets embarrassed, while the comment draws the attention of all the girls. Mahiro says that she doesn't, and also wonders if Satsuki is coming onto her.

Satsuki says that that is great and gives Mahiro a love letter. Mahiro and everyone else is shocked that Satsuki is asking her out, with Miyo being aroused by the idea. Satsuki apologizes for needing to drop this on Mahiro, and asks Mahiro if she can deliver the letter to one of the boys for her.

Mahiro is confused, and Satsuki asks Mahiro if she gets along with them pretty well, something that Mahiro can't disagree with. Mahiro asks which one, and Satsuki says that she wants it delivered to Yuta. Mahiro breathes a sigh of relief, finally understanding what it was.

Mahiro asks Satsuki if she thinks it would be better to give it to him herself. Satsuki gets embarrassed and refuses, saying that she could never do it as she thinks that with everything that's happened it'll turn weird.

Satsuki says that it would really help her out if Mahiro delivers it for her, and walks away with Minori before Mahiro can even say yes. Mahiro wonders what she's gotten herself into, causing her friends to laugh. Mahiro guesses that it's fine, as all she has to do is give it to him, and decides that she'd better get it over with.

Mahiro goes over and calls out to Yuta before giving him the letter, much to his surprise. Mahiro immediately turns around, relieved that she delivered it, and tells Yuta to make sure that he reads it. Yuta and Minato are left speechless, but get excited while reading the letter after realizing that their longstanding dreams are starting to come true.

The letter reads: "Dear Yuta, I'm always sorry for butting heads with you. I've actually been interested in you for a long time now. I'll be waiting for after school behind the gym". As the letter says, Satsuki waits there with Minori after school. Mahiro and Momiji watch her from a distance. Momiji says that they shouldn't be spying on them, but Mahiro admits to being curious now. She adds that she is basically their matchmaker, and Momiji agrees that there is some truth to that statement.

Momiji sees Yuta, and Mahiro loks around for him. Minato gives Yuta a thumbs up for good luck and begins to walk over. Instead of walking over to Satsuki however, he walks up to Mahiro and apologizes for keeping her waiting, much to Mahiro's confusion.

Yuta thanks Mahiro for the letter and admits that he was a little surprised to be honest. Satsuki is equally shocked that Yuta thought that Mahiro wrote the letter. Yuta says that if this is what Mahiro wants he'll go along with it. Mahiro and Momiji are shocked and Mahiro tells Yuta to wait a minute. She asks Yuta if he read the letter all the way, and a confused Yuta says that he did.

Minori asks Satsuki if she remembered to sign the letter, and Satsuki realizes in horror that she might have forgotten to. Minori pushes Satsuki forward so she can clean up the misunderstanding, much to her shock. She falls on the ground by Yuta and Mahiro, but can't figure out what to say. She ends up yelling out "Boys" like she always does, scaring Yuta and causing him to run away. Satsuki starts chasing after him, hoping to rectify what happened.

Mahiro notes that that was a close one, while Momiji is clenching her shirt over it. Minori tells Mahiro that its fine, as this was Satsuki's own doing. Mahiro agrees, noting that she feels kind of bad for both of them. Yuta and Minato say that it's okay, but in reality are a bit depressed that Mahiro wasn't interested in at least one of them. Nayuta notes that adolescence is bittersweet after all.

It is revealed that Satsuki had tried and failed once again to talk to Yuta, with Minori cheering her on while Minato watched her.

Characters

 * Mahiro Oyama
 * Momiji Hozuki
 * Asahi Ōka
 * Miyo Murosaki
 * Nayuta Tenkawa
 * Mai Yasaka
 * Miyako Nagase
 * Satsuki Tadaka
 * Minori Shiina
 * Minato Senkawa
 * Yuta Sakurada

Trivia

 * Yuta and Minato think that Mahiro likes one of them, fulfilling a longstanding desire for her to ask one of them out that became apparent in "Mahiro Pretties Up".