Fun game, saw it yesterday and it ate a surprisingly high number of hours already :)
two small issues:
* chapter13.rpy::2856 the "mp.hikari_points == 2" should be "mp.hikari_points >= 2", at this point of the game up to 3 points are possible
* chapter15.rpy::3680: "with dissolve" instead of "with dissolver", the latter makes the renpy framework rather unhappy (NameError: name 'dissolves' is not defined)
edited to add: twice in replay.rpy, replace "with dissole" with "with dissolve". you may take a look at the linter: https://www.renpy.org/doc/html/developer_tools.html