貝合わせ: tribadism

勝平: a male given name

開幕: rising of the curtain of a stage, the beginning of a performance; opening of a ceremony, festivity or conference

to buy so as to gather

(literary, uncommon) to argue

(slang) Alternative form of かっこいい

river surface

(video games) to provoke hatred from other players

a place of historical or archaeological importance; historic ruins; the remains of a previous civilization / land or position left by one who passes away; also, the person who inherits such

伊勢海老, 伊勢蝦: sea lobster