After Mari meeting MC she introduce herself as MC fiance which surprise MC friend, because of the age difference and make thing awkwards for MC, MC just acting stupid for a while, they talk a bit and they decide to go play games, it skip over to a net cafe(?), they are playing some online pc games, and MC feel really uncomfortable being there with Mari, after a while they take a break Mari go to the bathroom, the rival girl show up and ask to talk with Mari in private,which she accept and they go talk outside.
Resume of the talk is girly tell Mari that her relationship with MC is not normal and all wrong because of the age difference and she should break with him so he can enjoy his youth better by hanging and going out with girls his age, Mari kinda know that and get mad telling the girl that she should do whatever she want to try and get a hold of MC if she can until they graduate, if MC choose rival, Mari gonna leave, but if he choose Mari, rival dont have any reason to object while using some scary face, which she regret saying all that later, they skip over with MC and Mari over MC Father house with the 3 of them having dinner, between their talk, MC Father ask if the relationship is going well, which Mari respond that at least is from her part, MC Father ask why to MC but he avoid the question, later MC Father ask Mari to share a drink with him, they talk and the resume is MC Father telling mari that it would be weird if she wasnt afraid of marrying a 9 years younger guy and she shouldnt feel like she put some shackles on him, MC overheard and is show with a concerned/sad face.
Then it skip over to MC returning to school, rival girl find MC and tell him to go out with her, MC refuse, girl say that his relationship with Mari is not normal and that he should enjoy his youth and go out with people his age cuz he gonna regret later, beside is what Mari asked, which shook MC, but he still leave, later MC is shown walking slow as hell under the rain thinking about what to do, he call rival girl and tell her to pick him up, then call Mari telling her that is going over the apartment with someone, MC and rival girl arrive home, MC go take a shower and Mari and girl talk, girl repeat the same as before, MC show up and say, i have something to say i didn't before, Mari is my fiance, girly say i know, MC say yeah, despiste our age difference i love her and want to spend my time with her and wouldnt be able to bear with it if she were to go and marry another man, and ask Mari if she feel the same, Mari say she feel the same way, rival girl never had a chance anyway, rival girl ask why he called her then, and tell him not go out later saying that he regret not spending time making memories with a beautiful girl his age in a mocking tone, skip over they go to the roof(?) to watch the stars, they hug and mari want to propose, MC say that is the male duty, MC propose and say that he wish to make her happy and Mari respond that she wish that wish comes true.
Well this was really long lol, but the arc is just stupid, apparently 130 is the last chapter, well gonna wait until the other official site uploaded 130 to see, cuz comicgt don't mark them with completed