I've seen the anime opening, heard the OP song and read the report on Lef's smile being "the smile he wants to protect." I interpreted that instead as being "the smile that is worth living for or helped Volga live" and his jumping into the pool with his circle of friends as "embracing the present." The game has shown that in multiple scenes (even in the aftermath of Tharsix battle) that Volga suffered from PTSD from his past and the ending scene implies that he is happy and mentally stable. Will there be scenes in the later chapters/endgame of Volga healing from that condition?