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I forgot its title but I already read it months ago. It has a word 'orange' in its title (im not sure) but its about a boy who's failing and found this secret room in their school where his senpai is always spending his time. So he threatened him that if his senpai doesn't help him in his studies, he'll tell others about his secret room. The manga ended with them getting together and his senpai graduating... It's super wholesome manga and i really wanted to reread it... Can someone help me?
ps. The kohai and has a short black hair while the senpai has a light straight hair. And it has an extra where the kohai visited his senpai in his apartment...
Please help me!!!