Mr. Gundam was hospitalized for three weeks, his already old body did not adapt as well to the treatment as expected at first, but he was finally discharged. Even so, he was weak, he was screwed, going back to work was not an option and being alone even less so. Lala offered him to stay in her apartment, even if it was in Mouse's room, at least that way he would have someone to look after him in the afternoons while Bear took care of the shop.
This accelerated the decision to rent the apartment for the three of them, the two boys were delighted, and Mouse proposed to give them a small party, even if it was for them and Lala and Mr. Gundam.