Hikari seriously needs to get up out of his head, for real. He also needs to RELAX. Iroha is upset because she’s worried he still doesn’t trust her. He uses his “I’m a stupid antisocial otaku who can’t read the atmosphere” card as an excuse for not understanding her anger/concern.
Meanwhile, Ayado Sumie is the easiest person in the world to talk with, and gives thanks and praise to Hikari, along with a batch of fresh potatoes, for helping her “live on with pride in her body” and simply “talking to somebody.”
Between having Iroha as a girlfriend and Ayado as, well, an admirer (if not more), Hikari’s grows a big head without even noticing it, and when he spots Itou talking to a cat, he assumes it’s out of loneliness because he isn’t hanging out with him enough.
Itou rebuffs Hikari’s angle with extreme prejudice, and before he knows it, Hikari is alone, like he was before, only now it’s unbearable, even when he’s cooking. He recalls how he and Itou met, back when it was not only bearable, but natural.
Itou was constantly taken advantage of by the class thugs, and Hikari won’t give him the time of day, but when he recovers Hikari’s earbuds after said thugs threw them out the window, Hikari pays him back by not flaking out on an after-school art project foisted upon them.
When the thugs try to destroy Hikari’s 800-yen magazine he just bought, Itou snaps into action, “making his kindness into something that can be properly returned.” Itou gets slugged, but he gains Hikari as a friend.
After apologizing and making up with Itou, Hikari considers doing the same with Iroha…but chickens out. Still, he can’t bear her angry face, and so waits quietly outside her house like a stalker until he realizes how stalkery this all is and prepares to leave, but Iroha answers the door.
He gives her a peace offering of potato dumplings, and she invites him in, finally admitting she’s tired of being angry, as well as explaining why she was. Hikari responds that there’s no way he wouldn’t trust her; it’s just that he can’t believe how happy he is because of her.
After they kiss and hug, that feeling intensifies, and curdles into distrust not in Iroha, but his own animal urges, which he assumes are not wanted. He promptly—probably too promptly—flees, and the next day he’s incredibly awkward with Iroha once more, and warns her to stay away from him.
Once again, he finds it much easier to interact with his kohai Ayado than Hikari, and finds comfort in sitting beside her. He also gives her some potato dumplings, since she gave him the potatoes. This would all be fine if Iroha couldn’t watch them being so friendly from the windows.
When Arisa sees Iroha and asks what’s up, Iroha can only run into her arms, clearly distraught, and wonder “why it has to be this way”. Hikari isn’t trying to hurt her—in fact, he’s trying to do the opposite—but he needs to learn about boundaries with other girls while he’s dating one…especially if he’s going to run out on her when he’s at her house and run away from her at school.
Dude seriously needs to relax and stop committing unforced errors.