Damn, talk about a frustrating ending. Actually, it also felt so abrupt.
Tbh, u like what u like. Sano had no obligation to like her back and had never really showed any type of emotion in that direction, they were good friends that met constantly due to their solitude. But when Sano proposed to "try it out sleeping together" after Mori had confessed her feelings it could had been more, but the fact it wasnt... that completely destroyed Sano character for me. What she did then was awful, mostly how she reacted afterwards, the harsh things she said, almost as if blaming Mori, then not even apologizing and instead trying to force Mori to disregard her feelings just so she could feel better with her actions. Sure, she gave a hint prior, but considering Mori feelings and the present alcohol in her veins, it was still awfully unfair.
Overall, the only positive is that Mori might had overcome her trauma with her mom. This ending made the story just really ordinary.