異口同音: in concert

保育園: nursery school

生物兵器: a bioweapon, a biological weapon

でんでん太鼓: pellet drum

(idiomatic) Avoiding vanity or a showy appearance in oneself or in objects, such as by wearing plain clothes rather than gaudy clothes or driving a practical car rather than a sports car. Simplicity over vanity.

feelings for a departed one grow weaker over time; out of sight, out of mind

Good things don't last forever. Roses have thorns.

to go; to come to one's place / to (a letter) be delivered / to depart / to rely (on a method) / (年が～) to age / (うまく～) to go well / イく: (slang) to have an orgasm, to come, to cum

sacrifice

silkworm